Gym In A Box

Ultimate Muscles Smart Shirt

Regular price $389.00 Sale price $299.00
Shipping calculated at checkout.

Thank you for purchasing the GYM IN A BOX Smart Muscle  shirt ! We are confident that this product will help you achieve your fitness goals in a convenient and effective way.

Introducing the revolutionary GYM IN A BOX ToneUp15 ®️ shirt, the ultimate tool for achieving a sculpted and toned upper body. With 33 muscle toning and massager intensities and 10 powerful toning modes, this shirt is designed to strengthen your muscles, support your back, and say goodbye to flabby arms and abs. Not only does it provide an unparalleled workout experience, but it also offers a comfortable and unique sensation that will leave you feeling refreshed.

Easy to Use: The device will directly send a signal to muscles and promote muscle movement. All you have to do is to adjust the mode and massage intensity by the host. It's designed with power self-check function.

To ensure the best results, we recommend following our simple steps for optimal usage. First, charge both controller hosts with the provided USB cable. Then, attach the controllers to each side of the shirt by pressing them onto the snaps on both arms. Next, spray water on the inside of the shirt and on all electrode pads for maximum conductivity and comfort. For sensitive skin, we also recommend spraying water on your skin before use.

Once everything is properly set up, long press the on/off button for 2 seconds to turn on the power. From there, you can adjust the intensity with the "+" and "-" buttons and choose from 10 different toning modes by pressing the M button. It's important to start with lower intensities and work your way up gradually to get used to the sensation. With a total of 33 intensity levels, you can tailor your workout to your personal preferences.

After each session, the product will automatically turn off. If you need to stop midway, simply keep pressing the minute button until it shuts off. We recommend using the GYM IN A BOX Smart Muscle shirt at least once a day, five times a week for 15 minutes per session for the best results. And don't worry about maintenance, as the shirt can be hand washed with a mild detergent (just make sure to remove the controller first!).

For optimal comfort, we recommend using the shirt when relaxing at home. However, it can be used anytime and anywhere. Just be sure to avoid exposing it to heat, such as radiators, as it contains plastic. And finally, please do not iron the shirt.

Experience the power of the GYM IN A BOX Smart Muscle shirt and say hello to a stronger, more toned upper body.

The MicroCurrent technology used in this shirt may provide a unique sensation, but rest assured that it is designed for your comfort. You may initially feel a tickling sensation, so we recommend trying it out in a standing position first until you are accustomed to it.


Once your training session is complete, the program will automatically stop. If you wish to end the session earlier, simply press and hold the minute button until the device turns off. Always remember to turn off the device when putting it on or taking it off.

Important reminders for using the EMS shirt:

- Prior to wearing the shirt, we recommend spraying water on the silicone booster pads and your skin for better conductivity and comfort.

- You can use the product anytime, anywhere, but we suggest using it while relaxing at home for optimal results in toning your upper body.

- For best results, we recommend training with the shirt five times a week for 15 minutes per session. The program will automatically shut off after 15 minutes.

- When washing the shirt, please remove the controller first and hand wash with a mild detergent.

- Do not use the washing machine as this may damage the integrated wires.

- Do not twist the shirt to remove excess water, as it may damage the product.

- Do not use bleach, dry cleaning, or dry heat when washing or drying the shirt.

- As the shirt contains plastic, please keep it away from any sources of heat, such as radiators.

- Do not iron the shirt.

We hope this user manual provides all the necessary information for you to use your GYM IN A BOX EMS shirt. Thank you again for choosing our product and we wish you all the best on your fitness journey.

After every session, apply our LOVE YOUR BODY Fit & Firm Gel for better results!

10 Muscle Stimulation Booster Pads
33 Powerful Intensity Levels
10 Firming & Sculpting Fat-burn Workout Modes


  1. 360° Torso Compression Technology: The unique compression technology brings out the good part of your body.
  2. Abs Shaping Area: With that, the shape of your abs will come out nicely and more fitted.
  3. Muscle Micro-Current Massage Effect: The micros-massage effect accelerates weight loss. Micro-massage is the exertion of gentle, constant pressure on your body combined with muscle stimulation.
  4. Upper Back Trapezium System: This will drastically improve your body sensation and gives you a more confident body language
  5. Quality material: Our Products are made with the best fabrics to make you look and feel good


  • Shoulders/Arms
  • Abs
  • Core
  • Upper Back 
  • Lower Back

GYM IN A BOX™ is committed to creating functional activewear that goes beyond conventions. You are our #1 priority.

30 - day Money Back Guarantee for US orders,

All GYM IN A BOX™ products come with a 30 day Money Back Guarantee period which gives you great peace of mind.

-No returns or money back for international orders-

We offer a full refund of the purchase price for products returned to us within 30 days, beginning on the day after you received your product.  This guarantee is subject to the terms detailed below: - 

  • The 30 - day Money Back Guarantee only applies to products purchased directly from us at GYM IN A BOX™ and if you want to avail of it, the products must be returned to us directly. The return address will be advised by our Customer Care Team:
  • All returns require an authorization number which is issued by our Customer Care Team. To obtain an authorization number please contact us.
  • Shipping costs are non-refundable.
  • A return processing fee of $9.95 will be deducted from your refund.
  • GYM IN A BOX™ products purchased from other retailers are subject to those retailers’ refunds and returns policy.
  • Any products returned to us without an authorization number will not be refunded.
  • All products are your responsibility until they are received by us, therefore we recommend that you use a secure and traceable shipping method. If we do not receive your returned product(s), you will need to file a claim with the postal service directly.
  • All products returned to us for a refund must be returned at your own cost.
  • Damaged products will not be returned. They have to be in the original packaging.
  • International Shipping - Applicable taxes duties are the Customers responsibility

How can I return a product?
If you wish to return a product to GYM IN A BOX™ you have a 30-day Money Back Guarantee period, beginning on the day after you received your product, to return it, subject to the terms outlined here.  

To return a product, please contact us to request a return authorization number, you will also be provided with the address to return your products to.  Please note, all products are your responsibility until they are received by us, therefore we recommend that you use a secure and traceable shipping method.  All products returned to us for a refund must be returned at your own cost. 

Do I have to pay to return a product?
Yes, the cost of returning products within the 30-day Money Back Guarantee period must be covered by you.
Please note that we recommend using a secure and traceable shipping method as all products are your responsibility until they are received by us. 

When will I receive my refund?
As soon as your returned product(s) are received by us, you will automatically be refunded, within 10 working days, to the method of payment used when you placed your order.
You will receive a confirmation email when the product has been refunded.  If the funds aren't appearing in your account, please wait a few days and check again, as some banks take a little longer than others for the funds to reach your account.

I haven't received my refund
You will receive a confirmation email when your product(s) have been refunded.  If you paid by card, please make sure you check your bank statement.

If you made your original payment with a card that has since expired or has been cancelled, please contact your bank.  Your refund will always be processed to your original method of payment and cannot be sent to another card.
If you paid using another payment method, please contact the payment provider to locate your refund.

Taxes and Duties for US and Rest of the World

Please note that ordering from other countries outside of the US, duties & taxes will apply!


Germany is party to the European Union's Common Customs Tariff, therefore preferential rates apply to imports from countries which the EU has signed agreements with. Duties can arise up to 20 % of the original product price.

Can I exchange a product?
We're sorry, we do not offer an exchange service. However, you can simply return any unsuitable product to us for a full refund as per our Returns Policy and place a new order for the product(s) you want.

Wholesale / Customized Orders:

Customized orders are non refundable/ no returns are possible whatsoever.

Nika Cristiani
Cristiani’s Balance, Fitness & Nutrition, LLC
324 South Beverly Drive #1103
Beverly Hills, CA. 90212

Creator of  “GYM IN A BOX™"
Ultimate Toning Technology

Born In LA - Worn Worldwide

Q: “What is the CoreWrap?”
The CoreWrap is a posture enhancing Electronic Massager Corset, a Waist Trimmer with integrated "ToneUp15" STIM-FIT Massaging Boosters and Sweat Belt function. 
While you wear the CoreWrap, you can get the added effect of contracting your stomach muscles through a variety of programs designed to give them a workout without you having to do any exercises.  The massaging sensation also helps your body to relax more & recover and promotes better sleep. The corset design helps you sweat 5 times more and that results to burning more calories while your muscles are working.

Q: "Is it vibrating?“
The effect of the integrated 
STIM-FIT Massaging Bossters can make it feel like the product is vibrating. But this effect comes from the contractions of your own stomach muscles. So when you feel a vibrating effect, it is coming from your abs working out. 

Q: "Will it make me lose weight?“
STIM-FIT, like mechanical exercises, makes your muscles work and thereby burns calories. Studies have shown that this can be a supporting factor in a balanced weight loss program.

Q: “I am thin, can I use it?”
Your body shape does not matter. Everyone can benefit from the effects of our technology. Just because you are thin does not mean that your abs are toned or strong. And even if they are, STIM-FIT can still help you to improve their strength and shape.

Q: “Will it create abs?”
Your body creates abs. But it does so only if it is stimulated to do so, that is why we exercise. Wearing a CoreWrap with active STIM-FIT Technology is  great way to support this as it give you an easy way to achieve this stimulation without having to do taxing exercises on a regular basis. 

Q: "Can it hurt me?“
Any effective fitness equipment has the ability to hurt you if used incorrectly. However, working out with STIM-FIT is particularly kind on your joints and back and can therefore be a safer option for working out than many mechanical exercises. If you follow the product instructions, the product will be safe. Always think of safety first whatever you do. 

Q: “Can I wash it?"
The CoreWrap can be hand washed as per instructions, but the PowerBox & the snaps must be protected from all liquids and moisture. 

Q: “ What does the technology do?”
The technology uses low level STIM-FIT technology to achieve muscle contractions that are similar to a mechanical workout, such as crunches etc. A the top level, it is used by athletes to achieve peak workout performance. For daily use it provides a great support for regular workouts without having to do taxing manual workouts. 

Q: “Will it make me slimmer?”
STIM-FIT, like mechanical exercises, makes your muscles work and thereby burns calories. Studies have shown that this can be a supporting factor in a balanced weight loss program.

Q: “Is it safe?”
Any effective fitness equipment has the ability to hurt you if used incorrectly. However, working out with STIM-FIT is particularly kind on your joints and back and can therefore be a safer option for working out than many mechanical exercises. If you follow the product instructions, the product will be safe. Alway think of safety first whatever you do.

Q: “How long to see results?“
Every body is different and there are no hard and fast rules. Depending on your body you may feel results from the very first use. As with normal workouts, regular use and a healthy lifestyle are preconditions for any positive results. Our research and testimonies vary from noticeable results within the first 8-10 sessions to longer periods. 

Q: “Can I use it at the gym?“
Yes. You can use the CoreWrap in any situation that is safe. Adding it to your gym routine can be a very effective way in getting to your desired results sooner. 

Q: “How often can I use it?”
Exercise is only effective is it is done regularly. You can use your CoreWrap daily. Each program has an automatic shut-off to prevent over-use in single sessions. 

Q: “Which size should I choose?”
Please use the size instructions on the product website. 

Q: “Can men use it as well?“
Absolutely, the CoreWrap is unisex and can give men and women the same benefits. 

Q: “I’m 70 + can I use it?“
Absolutely, the CoreWrap can be used throughout all adult ages. However, if you have any underlying health conditions, please check with your doctor first.   

Q: “I’m pregnant can I use it?“
We do not recommend the use of the CoreWrap while you are pregnant. Please consult with your medical practitioner prior to any performance related physical workouts.

Q: “Why do I need to use the PowerBox?“
The PowerBox contains the batteries and control circuits for our workout programs. It has an easy to understand user interface that does not require you to connect to any other devices. In order for the STIM-FIT in our CoreWrap to work, you need to connect the PowerBox snap connectors to the snap connectors on the CoreWrap before putting it on. The PowerBox allows you to select from a range of different programs and regulate the intensity of the workout.

Q: "What’s the difference to conventional Shape-Wear?"
The CoreWrap not only gives you the same shaping benefits as conventional Shape-Wear while wearing it, it also actively stimulates your muscles and helps your body tone and burn fat simply by wearing it.

WIPE-OFF only!
  Line Dry / Hang Dry
  Do Not Bleach
  Do Not Tumble Dry
   Do Not Iron
  Do Not Dry Clean
  Fabric: 98% Latex-Free Neoprene,
  2% Silver Coated Nylon Tri-Cot

Customer Reviews

Based on 3 reviews Write a review

What Is Gym In A Box?


1. Spray water

On E-pads and your abdominal area, for highest comfort and ultimate user experience and better conductivity.

2. Set up Toning Program

Wrap and close the FitBelt tightly around your waist, choose between 4 powerful modes and turn on the device. Pace up the muscle contraction intensity to your comfort level, start slowly and increase with time.

3. Use it 15 min per day

No more crunches ! Relax and enjoy your automated power workout with thousands of muscle contractions in one toning cycle!

Customer Before/After



This product works better than a tummy tuck! Thank you Gym In A Box you made me feel great in ,y skin again after loosing 100 + pounds I could haver never done it without my CoreWrap ! Thank you so much!



OMG You need this ! I went from size 12 to size 8 in only 8 weeks using GYM IN A BOX 15 min. a day. I love it, this is the only thing that ever helped me with my love handles and belly fat!It's magic! 



The BEST device for postpartum belly recovery!Using Gym In A BOX CoreWrap for 6 week, I looked better than before my pregnancy. I saved thousands of Dollars on beauty Spa treatments !

30 Day, 100% Money-Back Results Guarantee

Though many customers report visible results after a few sessions, the affects of GYM IN A BOX CoreWrap often depends on the user - we recommend you give it at least 30 days.
So that you can give it a proper try, we offer a "30-Day, 100% Money-Back Results Guarantee".
If within 30 days you are unsatisfied for any reason, just let us know and we’ll give you a full refund, no questions asked.

As versatile as you

Fits ALL Bodytypes & Sizes !

Contour, Slim & Shape your body with the most innovative electronic corset ever. Keeps all your troubled areas in place . Sweat 5x more, strip off stubborn belly fat all while toning your abs and slimming your waist to the perfect hourglass figure.



Wear it. Wrap it. Tone it!