Today, challenge yourself to complete 100 push-ups. The push-ups can be divided up over the period of the entire day. For example:

11:00 a.m.- 25 push-ups
2:00 p.m – 25 push-ups
5:00 p.m.- 25 push-ups
8:00 p.m.- 25 push-ups

Push-ups are perfect for toning and tightening the entire upper body…here’s how: