yes, another hrm question

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I used my polar ft4 today for the first time and wet the strap, wore the chest strap and the watch. I started training mode in the locker room, that's why there will be a little time difference. Anyhow it said I burned 631 cals in 53 minutes and the arc machine said 493 cals in 50 min. Could I really be burning that much more? If so awesome! If not, crap, what am I doing wrong? I am 5' 6" and 199 lbs.

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