Clyde Williams, professor of sports science at Loughborough University, estimates that an hour of heavy work in a gym, perhaps running on a treadmill for 20 minutes, riding an exercise bike and doing several sets of weights would expend around 600-700 calories. If on the other hand you spent three hours in the garden, doing a range of jobs such as raking, digging, chopping logs and weeding, you would easily use the same amount, if not more. AND it's more fun !
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