Does the 100 push up challenge have you do all 100 push ups as one set? I do push ups like this: 26-24-22-20-18-16-14-12-10-8-6-4-2
I alternate between a set of regular push ups and a set of wide push ups, sometimes throwing in some staggers. That gets me to 182 push ups per session. Next up, I will be starting with 28, then continuing as above, to get me to 210 push ups.