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      02-01-2012, 10:24 AM   #10
Drives: VO 1M, 300zx TT
Join Date: Mar 2011
Location: Corpus Christi, Texas

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What is the most effective cardio as far as heat and time-effective? I personally think biking for cardio is dumb... but jump-rope and sprinting seem to work up a sweat pretty quick, as well as kick-boxing practice on a 200lb bag.

If I'm taking the proper amount of protein, but only doing cardio for a while, will I still lose muscle from burning calories?
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