Tennis balls packed with pennies weigh about a pound each. Doing ten throws has very little aerobic benefit; juggling continuous fast throws for ten minutes will work up a sweat.
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Just learning to juggle can be a exercise routine all on its own. But once you get the basics down, the very act of juggling can be an absolutely incredible cardio vascular workout. It involves very high repetitions of manipulating relatively small weight.Enjoy.
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