Good question. Active capsuleer duty does tend to limit the options for physical activities. Besides working out in a gym, I would have to say I absolutely love an outdoor shooting range where you can go through a course across the landscape where you have to find the targets and find and get to the best possible position to make the shots.
@Arrendis
I have thought about it, applied and got accepted as a candidate. More details on my run for CSM can be found here.