With the push-up challenge behind me, I decided to jump right into the sit up challenge. What can I say, I'm a brute for punishment. Like the push up challenge you have to do your initial test before you start the weekly program. In addition, you need to decide which sit up format you will do: traditional sit up or crunches. I decided to go with the crunches format, since it is easier on my back and neck. In 60 seconds, I did 43 sit ups, only 17 shy of the goal. Not bad for one who does not do sit ups regularly.