Inverted crunches using a chin-up bar?

Has it ever hurt your knees? I did some for a while but recently I have noticed that whenever I hang upside down for a while, I feel the chin-up bar digging into the back of my knees and it sort of hurts in an irritating way. Since then, I have padded the back of my knees but I'm sure there's a better way around... show more Has it ever hurt your knees?
I did some for a while but recently I have noticed that whenever I hang upside down for a while, I feel the chin-up bar digging into the back of my knees and it sort of hurts in an irritating way.
Since then, I have padded the back of my knees but I'm sure there's a better way around this problem. Suggestions, please?

I also have another question here if you could answer it as well - this question is about press-ups (also known as push-ups).

http://answers.yahoo.com/question/index;...
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