Sit-ups are great if you are trying to hurt your back.
http://www.livestrong.com/article/48...for-the-spine/
As for push-ups, I have tennis elbow and don't want to over stress it. I never go over 200 or below 100 a day. I was doing a lot of pull-ups at one point but then I moved and lost that little metal wedge for PERFECT PULL-UP and now I don't do any. I just use the lat-pull machine.



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