Obsessive–compulsive disorder (OCD) is amental disorder where people feel the need to check things repeatedly, perform certain routines repeatedly (called "rituals"), or havecertain thoughts repeatedly. People are unable to control either the thoughts or the activities for more than a short period of time.
Well, since there are no options
Swimming
Running
Cycling
These are a few examples
Hope they help :))
Its main purpose is to restore partial flow of oxygenated blood to the brain and heart. ♥