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From the thread title, I was going to suggest working up a good hardon and using it as a sundial. Watch for the shadow as it reflects on your abs to guesstimate the time. Heart rate? Not a problem.. your cock is rock hard. Safe to say, while staring at those sweaty pumped up body's, it should be rocking and pumping like a freight train.
As far as calories burned, just jerk a bunch of loads.
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