You know that blue stuff they gave you in elementary school to help you learn how inefficiently you brush your teeth? You swish it around after brushing and it shows up on all the places you missed that are rotting of plaque as you stand there staring in the mirror at your blue teeth?
I think push-ups serve the same purpose. For I have done my 100 yesterday and 43 so far today and I'm feeling muscles I didn't have last week.
Did you know that we have muscles on the sides of our boobs?
Yay, push-ups--the blue stuff for muscles.