Door pull-ups are a pretty good hack. Your t-shirt and shorts cut the friction enough that your body just slides along the door surface. Place a sock under eac

Door pull-ups are a pretty good hack. Your t-shirt and shorts cut the friction enough that your body just slides along the door surface. Place a sock under each palm for a more comfortable grip. Between that, push-ups, planks, going for a walk, and running up some stairs, you can keep a baseline of fitness which isn’t too shabby.