Yesterday I finished week 2 of the push up challenge. The required sets were: 16, 17, 14, 14, >= 20 with a 2 minute rest in between. I just barely managed to finish 20 in the last set. The next step in the challenge is to do an exhaustion test: do as many push ups as you can in a row with no rest. This determines what how your sets in the next few weeks will be organized. My first exhaustion test was back before week 1 started, and I managed 23 push ups. I'm hoping to do at least 30 now that I have a few weeks under my belt...but we'll see how things go :)