WhyWorkout.com -- Why Workout?
As of October 7, 2015, no live official trademarks were found on USPTO.gov for the exact term
This would be such an appropriate domain for a fitness center:
Ask the burning question, answer it, and offer a comprehensive workout program for potential out-of-shape members, especially around the New Year.
Most of us could use a comprehensive workout program, right?
Raise hand here...
So let's get physical.
A brandable and generic name for your workout center business.