Here is the selection for fitness and sports characters: 

Notes on exercise, athlete and sport-themed roles by Dr. Bon: 

This category is so vast and many players will have things in their closet to fit their role - especially if you get assigned a professional athlete or coach and you have some jerseys of your favorite team swinging on your hangers.

Also, the workout roles, such as fitness instructors or personal trainers can wear any workout attire, which we all have in one form or another. 

But there are some specific themed costumes above that are great if you want to put a cheeky twist on your character, such as wearing a football costume if you are an NFL coach, or a soccer ball costume or baseball glove. 

With any fitness character role - you can always grab a fitness t-shirt that has a funny saying on it about exercise, lifting, training, etc.