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The largest 24 Hour Gym and Fitness Center in Watertown, SD

Be A Better You!


If you are into bodybuilding, cardio workouts, power lifting, strength training, group fitness, or just getting started on fitness, we have weights & work out equipment for everyone! Not sure where to get started on fitness? Stop by and talk to one of our personal trainers to find an exercise plan that works best for you and your life.

Nutrition Store, Saunas, Tanning, Hydro Massage, Red Light Therapy & Many Other Amenities.

At The Gym, we offer many extras including red light therapy, hydro massage, tanning, Far Infrared Saunas, WiFi, Smoothies Plus Nutrition Store, and so much more. It's just like going to a day spa!

Your local gym and health club, fitness center & weight lifting gym located near you in downtown Watertown, SD.

The Gym Member Benefits

  • 24 Hour Full Service Fitness Center
  • Extensive Quality Lifting Equipment
  • Personal Trainers
  • Group Fitness Classes
  • Smoothie Plus Nutrition Store Discounts
  • Tanning
  • FAR Infrared Saunas
  • Hydro Massage
  • Red Light Therapy
  • InBody Body Composition Analyzer
  • Fitness on Demand Classes
  • Inversion Table
  • Weekly Prize Drawings

View Membership Options

  • elliptical
  • FAR Infrared Saunas
  • Nutrition Store
  • Free Weights
  • Red Light Therapy
  • TRX Bands
  • Tanning Beds
  • Hydro Massage

Upcoming Events



Everybody on Weights

Wednesday, 10-27-2021 at 6:00 pm

group fitness classes watertown sdFree Event to learn weight training basics. This group coaching event is for beginners looking to become more comfortable in the weight room and in using weight machines.

Get comfortable and more confident at the gym.  Weight Training is beneficial for Everyone!  That's why we are calling this group class Everyone on Weights.

Open to everyone, guys and gals, members of The Gym Inc. and non-members too. Call to get signed up, spaces are limited.



Incinerate TABATA

Thursday, 10-28-2021 at 5:30 pm to 6:30 pm

Utilizes high intensity interval training that torches fat & boost metabolism. You will get a sweat on with this TABATA group fitness class.

group fitness classes Watertown SD

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smoothie plus

We are more than just smoothies we are a full-line Nutrition Store!

Come in and talk with our friendly and knowledgeable staff. We want you to get educated on nutrition and health, not just sold on the latest fad product.  We want you to get the product you need to accomplish your goals. 

We offer a wide variety of nutritional items for everyone, our line-up includes supplements, vitamins, proteins, immunity and hormonal helps, diet and weight loss aids, sports nutrition, muscle and body building products, healthy snacks, energy drinks and so much more for your nutrition, health, and wellness needs.

From general health, to sports nutrition, to healthy snacks and sports drinks, we have something for everyone.

Stop by Smoothie Plus Nutrition Store in Watertown SD to find for all your supplements, health and wellness products. While here you can get a Protein Smoothie, a Pre Workout or Post Workout Drink or a delicious Meal replacement Shake made to order for you to take with you.

You don’t have to be a member of The Gym Inc. in Watertown SD to visit Smoothie Plus Nutrition Store, we are open to the public during staffed hours. The retail store is located right next to The Gym Inc. directly to the west at 203 E. Kemp Ave at a separate door entrance.

Open to the public during staffed hours in Watertown SD. Click here for our staffed hours.

Bonus: Members of The Gym Inc. Receive a Discount on all Smoothie Plus Nutrition Store Products!

News & Updates

Get Educated, Not Sold!

Author: The Gym Inc.

Posted On: 10-26-2021

Here at Smoothie Plus Nutrition Store in Downtown Watertown, SD, we want to be your advocate in making wise choices in nutrition and general health supplementation. It is important to make sure you are not just buying the latest gimmicky product being markete


Gain Energy and Get Pain Relief with Exercise and Strength Training

Author: The Gym Inc.

Posted On: 10-26-2021

Physical movement and exercise will increase your physical energy and relieve pain.  Just by moving more and by strengthening your muscles, you will feel more energized, and feel less pain. 


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What Our Customers Are Saying...

"I've been in many gyms across the country and this is hands down the cleanest. Great variety of equipment and friendly staff. Best 24 hr gym in Watertown."

Kurt K.

"One of the absolute best gyms I have ever been too. Great equipment, friendly staff, and great price. A must do if you are in the area."

Kevin J.

"The best gym I’ve joined. Owners are very nice and pleasant to chat with and staff are very helpful! Very easy to find the motivation to go to this gym with everything they have to offer, as well as the atmosphere."

Adam C.

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