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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My only exercise is running. And even that's pretty sketchy during most of the year. I run a decent amount over the summer in preparation for a particular half-marathon, then mostly stop until the next summer. I really need to keep at it just to see if I can get a decent time.