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Reading about CrossFit makes me a little queasy: http://en.wikipedia.org/wiki/CrossFit#Body_weight_exercises. A lot of these things don't seem very good for you. I feel like this stuff is going to come back to bite you in the ass in 20-30 years...

I personally would stick to basic weightlifting. You can get an intense 30-45 minute workout, don't put tons of pressure on your knees, and most importantly the long-term effects are very well-studied.

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