You may want to try and go for quantity. I started out killing myself to get out 200 every other day. Then everyday, and finally 300 the day I work out and 350 the day that I don't. Doing pushups everyday is not a great idea unless you have trained your body to do so, or just dont have a lot of time to get in shape. Also try using chairs, weights, or one handed pushups if you are short on time. There is something to be said for having three things- BenGay (Maximum Strenght), Aspirin, and a massager. Dont forget to stretch out every few sets!