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Old 02-07-2013, 05:16 PM   #66
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5 mph walking on hilly terrain is pretty strenuous exercise for some of us schlubs, so if tennis delivers a comparable or better workout it's not too bad from a fitness standpoint...

Singles is more like interval training than walking though, right? High intensity/rest/high intensity/rest. So it seems like there might be differences in effect that go beyond calories burned.
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