I'm trying this. I could do close to 100 when I was a scrawny teenager, now at 200+ lbs can't get past 30, lol. Wish me luck! http://hundredpushups.com/index.html
Just keep doing 10 more each day and in 10 days you will either be doing it or you will be so sore you will quit...hehehehe You could cheat and do girls pushups
pushups is a great exercise ....... checkout hindu pushups or indian pushups .. i bet who can do 100 normal pushup can do even 30 of indian push ups ..... see it to beleive it and do it to feel it ...... best of luck