Stamina 40-0100B User manual

When calling for parts or
service, please specify
the following number :
Model#: 40-0100B
40-0100R
CAUTION:
Weight limit is not applicable if product is used properly.
This unit is not designed to support a user’s weight. Read
all safety instructions before use.
Owner's Manual
This Product is Produced Exclusively by
2040 N. Alliance, Springeld, MO 65803
Customer Service
1 [phone]
www.staminaproducts.com
Product May Vary Slightly From Pictured.
!WARNING !
Exercise can present a
health risk. Consult a
physician before beginning
any exercise program with
this equipment. If you feel
faint or dizzy, immediately
discontinue use of this
equipment. Serious bodily
injury can occur if this
equipment is not assembled
and used correctly. Serious
bodily injury can also occur
if all instructions are not
followed. Keep others and
pets away from equipment
when in use. Always make
sure all bolts and nuts are
securely tightened prior to
each use. Follow all safety
instructions in this manual.
STAMINA PRODUCTS
MADE IN CHINA
© 2009 Stamina Products, Inc.
2009, 12

TABLE OF CONTENTS
Safety Instructions ...................................... 2
Before You Begin ........................................ 4
Equipment Warning & Notice Labels ........ 5
Assembly Instructions ................................ 6
Operational Instructions ............................. 7
Maintenance ................................................. 8
Storage ......................................................... 9
Conditioning Guidelines ........................... 10
Warm-Up and Cool-Down ......................... 11
Product Parts Drawing .............................. 12
Parts List .................................................... 13
Warranty ..................................................... 14
Fax/Mail Ordering Form ............................ 15
SAFETY INSTRUCTIONS
2
1. Read all warnings posted on the inStride® Foldaway Step'n Tone.
2. The inStride® Foldaway Step'n Tone should only be used after a thorough review of the
Owner’s Manual.
3. Do not stand on the inStride® Foldaway Step'n Tone.
4. Keep children away from the inStride® Foldaway Step'n Tone. Do not allow children to use or
play on the inStride® Foldaway Step'n Tone. Keep children and pets away from the inStride®
Foldaway Step'n Tone when it is in use.
5. It is recommended that you place this exercise equipment on an equipment mat.
6. Set up and operate the inStride® Foldaway Step'n Tone on a solid level surface. Do not position
the inStride® Foldaway Step'n Tone on loose rugs or uneven surfaces.
7. Make sure that adequate space is available for access to and around the inStride® Foldaway
Step'n Tone.
8. Before using, inspect the inStride® Foldaway Step'n Tone for worn or loose components, and
securely tighten or replace any worn or loose components prior to use.
9. Before using, Inspect the RESISTANCE BANDS(33, 34) and RESISTANCE HAND STRAPS(19)
for nicks and cuts. Do not use the RESISTANCE BANDS(33, 34) and RESISTANCE HAND
STRAPS(19) that are nicked or cut.
10. Before using, always check the FRONT FRAME(2) to be sure it is securely tighten with the
LOCKING KNOB(12).
11.Consult a physician prior to commencing an exercise program and follow his/her
recommendations in developing your tness program. If at any time during exercise you feel faint,
dizzy, or experience pain, stop and consult your physician.
12. Follow your physician’s recommendations in developing your own personal tness program.
13. Always choose the workout which best ts your physical strength and exibility level. Know your
limits and train within them. Always use common sense when exercising.
14. Do not wear loose or dangling clothing while using the inStride® Foldaway Step'n Tone.
15. Never exercise in bare feet or socks; always wear proper footwear such as running, walking, or
cross training shoes that t well, provide foot support, and feature non-skid rubber soles.
16. Always use the inStride® Foldaway Step'n Tone while seated. Never attempt to do exercises
while standing.
17. Weight limit is not applicable if product is used properly. This unit is not designed to support a
user’s weight. Read all safety instructions before use.
18. The inStride® Foldaway Step'n Tone should be used by only one person at a time.
19. The inStride® Foldaway Step'n Tone is for consumer use only. It is not for use in public or
semipublic facilities.
!WARNING: To reduce the risk of serious injury, read the following Safety Instructions
before using the inStride® Foldaway Step'n Tone.
WARNING: Before starting any exercise or conditioning program you should consult with your personal physician
to see if you require a complete physical exam. This is especially important if you are over the age of 35, have never
exercised before, are pregnant, or suffer from any illness. READ AND FOLLOW THE SAFETY PRECAUTIONS.
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS BODILY INJURY.
!

THANK YOU FOR PURCHASING THE
inStride® Foldaway Step'n Tone
To help you get started, we have pre-assembled most of your
inStride® Foldaway Step'n Tone at the factory with the exception
of those few parts left unassembled for shipping purposes.
Simply follow the few assembly instructions set forth in this manual.
With regular workouts, you will be getting your body into shape
and be on your way to achieving a happier and healthier lifestyle.
Should you have any questions,
please call our Customer Service Department toll-free number,
1 [phone]
Monday - Thursday, 7:30 A.M. - 5:00 P.M., Central Time.
Friday, 8:00 A.M. - 3:00 P.M., Central Time.
TELEPHONE
CUSTOMER SERVICE
Tel: [phone]
FAX
CUSTOMER SERVICE
Fax: [phone]
MAIL
STAMINA PRODUCTS, INC.
ATTN: Customer Service
P.O. Box 1071
Springeld, MO. 65801-1071
ONLINE
CUSTOMER SERVICE
[email protected]
www.staminaproducts.com
3
Call Us First
www.staminaproducts.com
1(800) 375-7520
Customer Service

Endcap
Endcap
Right Pedal Cap
Front Frame
Timer
Roller
Left Pedal Cap
Resistance Bands
Main Frame
Resistance
Hand Straps
Resistance Bands
Locking Knob
Endcap
Roller
Front Frame
Thank you for choosing the inStride® Foldaway
Step'n Tone. We take great pride in producing this
quality product and hope it will provide many hours
of quality exercise to make you feel better, look
better, and enjoy life to its fullest.
It's a proven fact that a regular exercise program
can improve your physical and mental health.
Too often, our busy lifestyles limit our time and
opportunity to exercise. The inStride® Foldaway
Step'n Tone provides a convenient and simple
method to begin your assault on getting your body
in shape and achieving a happier and healthier
lifestyle.
Before reading further, please review the
drawing below and familiarize yourself with the
parts that are labeled.
Read this manual carefully before using the
inStride® Foldaway Step'n Tone.
Although Stamina constructs its products with
BEFORE YOU BEGIN
the nest materials and uses the highest standards
of manufacturing and quality control, there can
sometimes be missing parts or incorrectly sized
parts. If you have any questions or problems with
the parts included with your inStride® Foldaway
Step'n Tone, please do not return the product.
Contact us FIRST!
If a part is missing or defective, please call
us toll free at 1-800-375-7520 (in the U.S.). Our
Customer Service Staff is available to assist you
from 7:30 A.M. to 5:00 P.M. (Central Time) Monday
through Thursday and 8:00 A.M. to 3:00 P.M.
(Central Time) on Friday.
If you would like to contact us online, go to our
website at www.staminaproducts.com and access
the Customer Service section.
Be sure to have the name and model number of
the product available when you contact us.
4
Warning Label

Label is larger than actual size
This chart is provided to help identify the warning and notice labels on the inStride® Foldaway
Step'n Tone. Please take a moment to familiarize yourself with all of the warning and notice labels.
EQUIPMENT WARNING & NOTICE LABELS
WARNING LABEL(27)W1
5

Place all parts from the box in a cleared area and position them on the oor in front of you. Remove
all packing materials from your area and place them back into the box. Do not dispose of the
packing materials until assembly is completed. Read each step carefully before beginning. If you
are missing a part please call our toll-free number for assistance 1-800-375-7520 or e-mail us at
[email protected].
ASSEMBLY INSTRUCTIONS
STEP 1: Place the inStride® Foldaway Step'n Tone in the position shown in illustration A. Remove
the LOCKING KNOB(12) from the MAIN FRAME(1).
STEP 2: Refer to illustration B. Unfold the FRONT FRAME(2) and secure with the LOCKING
KNOB(12).
6
A. B.
STEP 3
Place the inStride® Foldaway Step'n Tone in the
normal use position. Install one AAA battery into the
TIMER(11), one battery included. See page 8 for
detailed battery installation instructions. Slide the
TIMER(11) onto the plate on the MAIN FRAME(1).
Refer to illustration F.
C.

OPERATIONAL INSTRUCTIONS
7
G.F.
There are two optional RESISTANCE HAND STRAPS(19) that can be attached to the inStride®
Foldaway Step'n Tone to add upper body toning to your cardiovascular workout. The RESISTANCE
HAND STRAPS(19) can be attached as follows:
1. Simply hang the RESISTANCE HAND STRAPS(19) on the ROLLERS(5) on both sides. Refer to
illustration F.
2. Remove the ENDCAPS(15) from the FRONT FRAME(2). Slide the RESISTANCE HAND STRAPS
(19) onto the FRONT FRAME(2) on both sides. Press the ENDCAPS(15) back on to the FRONT
FRAME(2). Refer to illustration G.
You can adjust the pedal resistance in two ways.
1. There are three slots on the backs of the LEFT and RIGHT PEDAL CAPS(7, 8). Attach the HOOK
HANDLES(32) at different positions to adjust the resistance. Move the HOOK HANDLES(32) to the
top slot for less resistance, to the middle slot for medium resistance, or to the bottom slot for most
resistance.
2. Choose the set of black regular RESISTANCE BANDS(33), the set of red power RESISTANCE
BANDS(34), or both sets of bands. Using one set of bands, hang the RESISTANCE BAND(33 or 34)
on each HOOK HANDLE(32) as shown in inset drawing E in the below illustration. Using two sets
of bands, hang RESISTANCE BANDS(33 and 34) on each HOOK HANDLE(32) as shown in inset
drawing D. Then slide the HOOK HANDLE(32) into one of the slots on the LEFT and RIGHT PEDAL
CAPS(7, 8).
RESISTANCE
BAND(33 or 34)
RESISTANCE ADJUSTMENT:
USING THE RESISTANCE HAND STRAPS(19):
D. E.
Using two bands
on each side.
Using one band
on each side.

OPERATIONAL INSTRUCTIONS
8
USING THE ELECTRONIC TIMER
NOTE: Rechargeable batteries are not recommended.
1. Open the Battery Door on the back of the timer.
2. The timer operates with one AAA battery, one battery included.
Refer to the illustration to install or replace the battery.
HOW TO INSTALL AND REPLACE BATTERIES:
AAA Battery
The safety and integrity designed into the inStride® Foldaway Step'n Tone can only be maintained
when the inStride® Foldaway Step'n Tone is regularly examined for damage and wear. Special
attention should be given to the following:
1. Inspect the RESISTANCE BANDS(33, 34) and RESISTANCE HAND STRAPS(19) for nicks and cuts.
Replace damaged RESISTANCE BANDS(33, 34) and RESISTANCE HAND STRAPS(19).
2. Verify that the WARNING LABEL(27) is in place and easy to read. Call Stamina Products immediately
at 1-800-375-7520 for a replacement WARNING LABEL(27) if it is missing or damaged.
3. It is the sole responsibility of the user/owner to ensure that regular maintenance is performed.
4. Worn or damaged components shall be replaced immediately or the inStride® Foldaway Step'n
Tone removed from service until repair is made.
5. Only Stamina Products supplied components shall be used to maintain/repair the inStride®
Foldaway Step'n Tone.
6. Keep your inStride® Foldaway Step'n Tone clean by wiping it off with an absorbent cloth after use.
MAINTENANCE
1. To time your workout, begin by pressing and holding the
button on the face of the timer until zeros are displayed.
Release the button.
2. Start the timer by pressing and releasing the button. Now you
are ready to begin your workout.
3. To stop or pause the timer, press and release the timer button.
This freezes the workout time. To resume your workout without
losing the time displayed before stopping or pausing, press
and release the button again.
4. When you complete your workout, press and release the timer
button. The timer will automatically turn off after being in stop
or pause mode for 4 minutes.
TIMER Function: The electronic timer displays minutes and
seconds up to 99.59.
NOTE: Even after the timer automatically turns off, the time that was displayed prior to shut off will
remain in memory. To resume your workout without losing the time displayed before stopping,
press and release the timer button. To clear the time and start a new workout, press the timer
button and hold it down for two seconds.

3.2.
1. To store the inStride® Foldaway Step'n Tone, simply keep it in a clean dry place.
2. To avoid damage to the electronics timer, remove the battery before storing the inStride® Foldaway
Step'n Tone for one year or more.
3. Grasp both the stabilizer of the MAIN FRAME(1) and FRONT FRAME(2) to move the inStride®
Foldaway Step'n Tone.
STORAGE
9
1. Remove the TIMER(11) from the MAIN FRAME(1).
If the TIMER(11) is not removed then it may
become damaged while it is being stored. Refer to
illustration 1.
TO FOLD THE inSTRIDE® Foldaway Step 'N Tone FOR EASY STORAGE
2. Place the inStride® Foldaway Step'n Tone in the position shown in illustration 2. Adjust the HOOK
HANDLES(32) to the top slots in the LEFT and RIGHT PEDAL CAPS(7, 8). Remove the LOCKING
KNOB(12) and fold the FRONT FRAME(2). Refer to illustration 2.
NOTE: If the HOOK HANDLES(32) are not adjusted to the top slots in the pedal caps, the
RESISTANCE BANDS(33, 34) may become damaged while being stored.
3. Refer to illustration 3. The FRONT FRAME(2) should secure by the PLASTIC HOLDER(30) in folded
position. Bolt the LOCKING KNOB(12) to the MAIN FRAME(1) for storage.
1.

How you begin your exercise program depends on your physical condition. If you have been inactive for
several years or are severely overweight, start slowly and increase your workout time gradually. Increase
your workout intensity gradually by monitoring your heart rate while you exercise.
Initially you may only be able to exercise within your target zone for a few minutes; however, your aerobic
capacity will improve over the next six to eight weeks. It is important to pace yourself while you exercise
so you don't tire too quickly.
Measure your heart rate periodically during your workout by stopping the
exercise but continuing to move your legs or walk around. Place two or
three ngers on your wrist and take a six second heartbeat count. Multiply
the results by ten to nd your heart rate. For example, if your six second
heartbeat count is 14, your heart rate is 140 beats per minute. A six second
count is used because your heart rate will drop rapidly when you stop
exercising. Adjust the intensity of your exercise until your heart rate is at the
proper level.
wrist pulse
Remember to follow these essentials:
Have your doctor review your training and diet programs.
Begin your training program slowly with realistic goals that have been set by you and your physician.
Warm up before you exercise and cool down after you work out.
Take your pulse periodically during your workout and strive to stay within a range of 60% (lower
intensity) to 90% (higher intensity) of your maximum heart rate zone. Start at the lower intensity, and
build up to higher intensity as you become more aerobically t.
If you feel dizzy or lightheaded you should slow down or stop exercising.
To determine if you are working out at the correct intensity, use a heart rate monitor or use the table
below. For effective aerobic exercise, your heart rate should be maintained at a level between 60%
and 90% of your maximum heart rate. If just starting an exercise program, work out at the low end of
your target heart rate zone. As your aerobic capacity improves, gradually increase the intensity of your
workout by increasing your heart rate.
CONDITIONING GUIDELINES
Target Heart Rate Zone Estimated by Age*
* For cardiorespiratory training benefits, the American College of Sports Medicine recommends
working out within a heart rate range of 55% to 90% of maximum heart rate. To predict the
maximum heart rate, the following formula was used: 220 - Age = predicted maximum heart rate
20 years
25 years
30 years
35 years
40 years
45 years
50 years
55 years
60 years
65 years
70 years
Average Maximum
Heart Rate 100%
Age
110-180 beats per minute
107-175 beats per minute
105-171 beats per minute
102-166 beats per minute
99-162 beats per minute
97-157 beats per minute
94-153 beats per minute
91-148 beats per minute
88-144 beats per minute
85-139 beats per minute
83-135 beats per minute
200 beats per minute
195 beats per minute
190 beats per minute
185 beats per minute
180 beats per minute
175 beats per minute
170 beats per minute
165 beats per minute
160 beats per minute
155 beats per minute
150 beats per minute
Target Heart Rate Zone
(55%-90% of Maximum Heart Rate)
10

WARM-UP and COOL-DOWN
Warm-Up The purpose of warming up is to prepare your body for exercise and to minimize injuries.
Warm up for two to ve minutes before strength training or aerobic exercising. Perform activities that
raise your heart rate and warm the working muscles. Activities may include brisk walking, jogging,
jumping jacks, jump rope, and running in place
Stretching Stretching while your muscles are warm after a proper warm-up and again after your
strength or aerobic training session is very important. Muscles stretch more easily at these times
because of their elevated temperature, which greatly reduces the risk of injury. Stretches should be held
for 15 to 30 seconds. Do not bounce.
Suggested Stretching Exercises
Remember to always check with your physician before starting any exercise program.
Cool-Down The purpose of cooling down is to return the body to its normal, or near normal, resting
state at the end of each exercise session. A proper cool-down slowly lowers your heart rate and allows
blood to return to the heart. Your cool-down should include the stretches listed above and should be
completed after each strength training session.
Lower Body Stretch
Place feet shoulder-width
apart and lean forward.
Keep this position for 30
seconds using the body as a
natural weight to stretch the
backs of the legs.
DO NOT BOUNCE!
When the pull on the back of
the legs lessens, gradually
try a lower position.
Floor Stretch
While sitting on the oor,
open the legs as wide as
possible. Stretch the upper
body toward the knee on the
right leg by using your arms
to pull your chest to your
thighs. Hold this stretch 10
to 30 seconds.
DO NOT BOUNCE!
Do this stretch 10 times.
Repeat the stretch with the
left leg.
Bent Over Leg Stretch
Stand with feet shoulder-
width apart and lean forward
as illustrated. Using the
arms, gently pull the upper
body towards the right leg.
Let the head hang down.
DO NOT BOUNCE!
Hold the position a minimum
of 10 seconds. Repeat
pulling the upper body to
the left leg. Do this stretch
several times slowly.
Bent Torso Pulls
While sitting on the oor,
have legs apart, one leg
straight and one knee bent.
Pull the chest down to touch
the thigh on the leg that is
bent, and twist at the waist.
Hold this position at least 10
seconds. Repeat 10 times
on each side.
11

PRODUCT PARTS DRAWING
12
FRONT
BACK

PART# PART NAME QTY
1 Main Frame 1
2 Front Frame 1
3 Shaft 1
4 Bushing 2
5 Roller 2
6 Spacer 2
7 Left Pedal Cap 1
8 Right Pedal Cap 1
9 Guide 2
10 Pedal Sleeve (ø7 x ø15 x 49mm) 2
11 Timer 1
12 Locking Knob 1
13 Lower Sleeve (ø7 x ø12 x 44mm) 2
14 Sleeve Cap 2
15 Endcap 4
17 Resistance Tube, black color 2
18 Power Resistance Tube, red color 2
19 Resistance Hand Strap 2
20 Bolt, Button Head (M6 x 1 x 16mm) 4
21 Bolt, Button Head (M6 x 1 x 68mm) 2
22 Bolt, Button Head (M8 x 1.25 x 45mm) 1
23 Nylock Nut (M6 x 1) 2
24 Nylock Nut (M8 x 1.25) 1
25 Washer (M6) 2
26 Washer (M8) 1
27 Warning Label 1
29 Manual 1
30 Plastic Holder 1
31 Screw, Round Head (M5 x 0.8 x 15mm) 1
32 Hook Handle 2
33 Resistance Band, black color 2
34 Power Resistance Band, red color 2
PARTS LIST
13

LIMITED WARRANTY
WARRANTY
MODEL 40-0100B/40-0100R
Stamina Products, Inc. warrants that this product will be free from defects in materials and workmanship
under normal use, service and proper operation for a period of 90 days on the parts and one year on
the frame from the date of the original purchase from an authorized retailer. THIS WARRANTY SHALL
NOT APPLY TO ANY PRODUCT WHICH HAS BEEN SUBJECT TO COMMERCIAL USE, ABUSE,
MISUSE, ALTERATION OF ANY TYPE OR CAUSE OR TO ANY DEFECT OR DAMAGE CAUSED BY
REPAIR, REPLACEMENT, SUBSTITUTION OR USE WITH PARTS OTHER THAN PARTS PROVIDED
BY STAMINA PRODUCTS, INC. Commercial use includes use of the product in athletic clubs, health
clubs, spas, gymnasiums, exercise facilities, and other public or semipublic facilities whether or not the
product's use is in furtherance of a prot making enterprise, and all other use which is not for personal,
family, or household purposes.
To implement this limited warranty, send a written notice stating your name, date, and place of purchase
and a brief description of the defect along with your receipt to Stamina Products, Inc. P.O. Box 1071,
Springeld Missouri, USA, 65801-1071, or email us at [email protected], or
call us at 1-800-375-7520. If the defect is covered under this limited warranty, you will be requested to
return the product or part to us for free repair or replacement at our option. NO ACTION FOR BREACH
OF THIS LIMITED WARRANTY MAY BE COMMENCED MORE THAN ONE (1) YEAR AFTER THE
DATE THE ALLEGED BREACH WAS OR SHOULD HAVE BEEN DISCOVERED. NO ACTION FOR
BREACH OF ANY IMPLIED WARRANTY MAY BE COMMENCED MORE THAN ONE (1) YEAR AFTER
DELIVERY OF THE PRODUCT TO THE PURCHASER. This limited warranty is not transferable. IF
ANY PART OF THE PRODUCT IS NOT IN COMPLIANCE WITH THIS LIMITED WARRANTY OR ANY
IMPLIED WARRANTY, THE REMEDY OF REPAIR OR REPLACEMENT IS THE EXCLUSIVE REMEDY
AVAILABLE TO YOU. In the event that the purchaser makes any claim under this limited warranty or any
implied warranty, the Warrantor reserves the right to require the product to be returned for inspection,
at the purchaser's expense, to the Warrantor's premises in Springeld, Missouri. Return of the enclosed
warranty registration card is not required for warranty coverage, but is merely a way of establishing the
date and place of purchase.
Stamina Products, Inc. SHALL NOT BE LIABLE FOR THE LOSS OF USE OF ANY PRODUCT, LOSS
OF TIME, INCONVENIENCE, COMMERCIAL LOSS OR ANY OTHER INDIRECT, CONSEQUENTIAL,
SPECIAL OR INCIDENTAL DAMAGES DUE TO BREACH OF THE ABOVE WARRANTY OR ANY
IMPLIED WARRANTY.
This limited warranty is the only written or express warranty given by Stamina Products, Inc. This
warranty gives you specic legal rights, and you may also have other legal rights which vary from state to
state. ANY OTHER RIGHT WHICH YOU MAY HAVE, INCLUDING ANY IMPLIED WARRANTY OR
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, IS LIMITED IN DURATION TO
THE DURATION OF THIS WARRANTY.
The laws in some jurisdictions restrict the rights of manufacturers and distributors of consumer goods
to disclaim or limit implied warranties and consequential and incidental damages with respect thereto.
If any such law is found to be applicable, the foregoing disclaimers and limitations of and on implied
warranties and consequential and incidental damages with respect thereto shall be disregarded and shall
be deemed not to have been made to the extent necessary to comply with such legal restriction.
14

IMPORTANT : Before lling out the form below make sure you have the right information.
Refer to the parts list to make sure you're ordering the right parts!
Detach and Mail or Fax the Form Below
Stamina Products, Inc.
P.O. Box 1071
Springeld, MO 65801-1071
IMPORTANT : We must have your phone number in order to process the order!
Please do not return the product. For your convenience, Stamina's Customer Service Department can be
reached by email at [email protected] or toll free at 1-800-375-7520 (in the U.S.).
Should a part be missing or a defective part found, please call us from 7:30 A.M. to 5:00 P.M. Central
Time, Monday through Thursday and 8:00 A.M. to 3:00 P.M. on Friday or ll out the fax sheet ordering
form below and fax it to [phone]. Our Customer Service Department will be able to assist you with
your problem and the part will be mailed directly to your house.
Mr./Ms:
Address: Apt. #:
City: State: Zip Code:
Phone #: ( ) Work Phone #: ( )
Date Purchased:
Model #:
Purchased From:
 PART # DESCRIPTION QUANTITY
 1 Rear Unit Assembly 1
EXAMPLE:
FAX/MAIL ORDERING FORM
TELEPHONE
CUSTOMER SERVICE
Tel: [phone]
FAX
CUSTOMER SERVICE
Fax: [phone]
MAIL
STAMINA PRODUCTS, INC.
ATTN: Customer Service
P.O. Box 1071
Springeld, MO. 65801-1071
ONLINE
CUSTOMER SERVICE
[email protected]
www.staminaproducts.com