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Guesstimating calories for exercise

Mr_Boy
Mr_Boy Posts: 42 Member
edited February 13 in Fitness and Exercise
Is there a simple formula one can use for cardio exercise? I was wondering if it really boils down to heart-rate for a given person, i.e. if I run at 140bpm would I burn calories as fast as swimming or cycling at 140bpm?

I've been playing Grand Slam Tennis on the Wii and it genuinely constitutes exercise I think, based on the test "does it make you sweat?" The game even has a calorie-tracking function but I don't trust it since it didn't ask for my weight, age, etc. I'd like to figure out a ballpark figure to use for an hour playing.
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