HIIT, and sports.
Other than that I don't really do cardio as in high heartrate, I normally stick longer duration/lower heartrate stuff for a more anaerobic workout(jogging,e;lipticals,bike). IMO intense cardio has to high a chance to eat away muscle, even though it is good for the cardiovascular system.
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-OTK's LOG-
We lift weights and manipulate our diets so that we'll look good naked. Sure, it's healthy too, and we'll probably live a longer and more productive life than the average guy, but mostly it's about the naked thing.

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