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

Be A Better You!

Fitness For Everyone.

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

Nutrition Store, Saunas, Tanning, Hydro Massage, & 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 health club, fitness center & 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



Incinerate TABATA


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



ABC'S - Arms Butt Core


Go back to the basics of strength focused exercises to define, strengthen & firms your favorite muscle groups! Exercises & intensity levels vary for fun and ever increasing results.




TNT Tighten & Tone Circuit Training


Get Ready A STRONG Body with this Fast Paced calorie burning strength training circuit workout to get you tightened and toned on your journey for weight loss and a toned body.

View Full Calendar

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 to educate you on nutrition and health, not just sell you stuff.

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, and so much more for your nutrition, health, and wellness needs.

From general health, to sports nutrition, to healthy snacks and 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. 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

Never Fear Craig Is Here To Help With Supplements!

Posted On: 05-07-2021

We want to be your advocate in making wise choices in nutrition and supplementation.


Compete Against Yourself

Posted On: 04-30-2021

Carla's advice on Competing Against Yourself to achieve the goals you set.


View All News & Updates

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.

The Gym Inc. Location
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