Overweight & out-of-shape, I checked into the resort with great apprehension. What is awesome is that the trainers & staff adapt workouts for ALL fitness levels. They assist each guest to overcome their current status and achieve much higher levels, but there is no yelling at you like on the TV show.
Make sure you sign up for a massage early in your stay. The cost is extra to your weekly fee, but rates are reasonable. You'll need it after exercising 6 hours each day. I cannot say enough about the masseuses. They provide, literally, restorative massages. The hot tub also helps with sore muscles, as does the daily 6am stretch class (optional, but well worth it).
The food is very delicious & satisfying. I never went hungry, and I have quite an appetite. By the end of the week, as I adjusted, I routinely left food on the plate. So you're also learning portion control.
The rooms are fine-- you don't spend much time in them. The staff is incredibly helpful. I had a wonderful time making lifestyle changes that I continue to build on. I'm so glad I overcame my fear and apprehension. Just go.