Pound World Records  

Darryl Learie performed a four-finger [plank exercise][1] without using his thumbs or pinkies while carrying 50 pounds of additional weight on his back. He remained balanced in position for 24.32 seconds. [1]: http://exercise.about.com/od/abs/ss/abexercises_10.htm

Flavio Codrin, a man over the age of 70, performed 1,200 push-ups in one hour while carrying an additional 40 pounds of weight on his back.