HEART RATE MONITOR/ZUMBE (UPDATE)

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Well, I took everyone's advice and returned my original HRM and purchased one with a strap. I burnt 582 calories today in Zumba and 150 on the Curves Circuit. Much better!!!! My instructor put in a few new routines today, so a probably wasn't working as hard as I do when we do the ones I already know. Thanks for all the advice.