Be fit is not enough, to keep fresh your brain try to handle this crowded fitness center. Each customer has a different kind of body and so a different exercise to perform, you see this at the top left area. Take your customer to the right area according to his needs and decide the intensity of his work. His health will decline if you assign him wrongly. Avoid losing more than 3 customers per level!
Drag and drop to move the clients to the right zone, and click at the right options to decide the intensity of their exercise.