I first read about this on Ruth's Blog, then I found it on another blog Canned Laughter.
One Hundred Push-ups
I did the first three days, but then with moving I was distracted and never got back to it. But on last count I did 56, rotating between regular push-ups and girly ones. So I am going to start again, and I challenge you to try it!
You can sign up for a push-up logger to keep track online.