I'm also curious about this, since my dysphoria has flared right before my surgery and I just can't bring myself to run in a binder anymore. I was going to ask my doc what she thought of running in a controlled environment (e.g. treadmill at the gym). You could probably get away with weightless squats (just don't use a barbell) and stuff like calf raises, done on a stair step. Lower-body workouts should be fine, especially if fairly isolated ones, such as squats, toe/calf raises, lunges, etc.