Sign up for a free trial session and you’ll be able to get a feel for what CrossFit Phos is all about. Our coaches will be notified you are coming before class begins and will be prepared to modify to your individual skill level.



Open Gym Only

  • 24 Hour access to our West side facility outside of scheduled class times only
  • Approval Required


  • Coach Led – Group Crossfit WOD
  • Coach Led – Group Sweat Class
  • Access to both Sioux Falls Locations
  • 24 hr Access to Frontier Fitness – East Side
  • 24 Hour Open Gym access to our West side facility +$15


CrossFit is a precise combination of exercise and nutrition that has been proven to increase fitness and health for people of all ages and abilities. CrossFit takes functional movements such as presses, pulls, pushes and squats, and performs them with high intensity in a constantly varied manner throughout different modalities such as resistance training (weights), metabolic conditioning (cardio) and body-weight workouts.

Yes. Everyone can do CrossFit regardless of age, injuries and current fitness level. The program can be modified for each athlete to help him or her become fitter and healthier. Grandparents and Olympians—and everyone in between—can perform modified versions of the same workout.

No. CrossFit is the fitness and nutrition program that will get you in shape. No matter what your current fitness level is, you can start CrossFit. You can start CrossFit if you’ve never worked out, if you have injuries, or if you’re sick or overweight. CrossFit workouts are modified to help each person succeed, improve fitness and take daily steps toward goals. As you become fitter, your workouts will be adjusted to challenge you at your new level.

Yes. CrossFit training is very safe, and sitting on your couch is dangerous. In CrossFit boxes, credentialed trainers provide precise instructions and coaching to help people move safely and efficiently, helping them avoid all the diseases and injuries that come from inactivity, obesity and poor nutrition.

To accomplish your goals faster, we recommend you eat a variety of healthy foods in quantities that support fitness training but not body fat. By avoiding excessive amounts of refined carbohydrates (sugars) and measuring your protein, carbohydrate and fat intake, you will see measurable increases in health. Here’s a simple starting point: Eat meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar. For more detailed nutrition plans, CrossFit Phos offers nutrition consultations and one-on-one nutrition coaching.

CrossFit holds a uniquely elegant solution to the greatest problem facing the world today: chronic disease. The CrossFit program—constantly varied high-intensity functional movement coupled with meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar—can give you a pass on chronic disease. If you are not sick, know that fitness provides a great margin of protection against the ravages of time and disease. Fitness is, and should be, “super-wellness.” To improve or preserve your health, do CrossFit.

CrossFit improves general physical preparedness (GPP). We have designed our program to elicit as broad an adaptational response as possible. CrossFit is not a specialized fitness program but a deliberate attempt to optimize physical competence in each of 10 fitness domains: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance and accuracy. CrossFit was developed to enhance an individual’s competency at all physical tasks. People who do CrossFit are prepared for all challenges, whether they come in the the gym, on a playing field or as part of daily life.

The coach will assist you in finding a weight that’s manageable for you. The coach will also help you replace or modify movements you can’t do with those you can.

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