I'd fallen off the wagon a bit with my hundred pushups workout so I dropped back to Week 3 tonight. (We were without air conditioning for a week, and doing much of anything physical was a chore.) At the suggestion of Fit36 I tried tightening up the rest periods between the levels, and ended up failing to do the minimum number of pushups on the max level all in one stint; I ended up five short (15, 12, 12, 10, 10) but went back to do the other five about 30 seconds later.
I'm still thinking that going for more pushups each workout, rather than trying to cut the breaks down to the prescribed amounts, is what I need. I'm more than happy taking a good long time to get through 100 pushups in a row, but I need to keep myself from getting injured, and I also need to lose some more of the weight. More pushups means more calories burned.