I do cardio and heavy weights
And a hell of alot of pushups and crunches
Heavy weights are heavy for you, not necessarily legitimately "Heavy" weights, but just enough to build muscle.
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After I finished phys-ed in College I didn't work out proper for about three years. I tried to get back into it again a couple of months ago (muscle training circuit) and I gave up after a couple of weeks. I keep meaning to get back into it.