If you have back pain when doing push ups you can start by doing it on your knee instead of your feet...
Also your lower back or abs might be not strong enough. do sit ups and do exercise for your lower back. A good one is about the same thing than push ups...
the way to do it is to take the push ups position with your hands in front of you and not on the side, except that you have to take position on your forearms instead of your palms..... you can vary the difficulty by moving your forearms forward or towards you..... stay in this postion for about 30 seconds or until you have pain... your back have to be straight, when you lower back is curving towards the floor its time to stop.....
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