How to Build Up to a Push-Up
Make the hard start, easier
In the beginning push-ups are hard. If you try to do a push-up and can’t, go on your knees and do a push-up that way. You work the same muscles but you place less weight on them. So with each one you simply become stronger.
Strength comes with repetition. The more you do, the stronger you get and the easier it all becomes.
What they work
Push-ups work your arms (triceps and forearms), your chest, lower back, abs, quads and calves. They work the intercostal muscles covering your ribs and if you do enough of them and breathe in and out explosively as you do them they even work your lungs which means they become an aerobic exercise that also works your cardiovascular and aerobic systems.
Courtesy of Darebee.