You wear a band on your arm that has a heart rate monitor in it. And you also have one on your leg. Together both bands act as sensors and the game tells you if you are doing the exercise properly.
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I took the plunge and bought zumba I got it online so still waiting for it so soon I'll be able to update
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oooh MrsS, I'm excited but you take it easy ok :)
beansneans thanks for the info. Might upgrade.