An old parkour friend of mine started doing 10 pushups on the hour every hour he was awake. Then after a week, he would move up to 11, 12, etc. When he got to

An old parkour friend of mine started doing 10 pushups on the hour every hour he was awake. Then after a week, he would move up to 11, 12, etc. When he got to 25, he started over with inclined pushups. If you're into rock climbing, you could instead switch to tri-pushups or fingertips. It makes for a really good break from whatever you're working on during the day. I could never quite get on it due to my classload, but he does probably 100 handstand pushups a day.