By Andrew Heffernan / June 2013: Discover Something WonderfulWhen it comes to cardio exercise, most gym-goers are either hares or tortoises: They like their workouts fast and furious or they like them slow and leisurely. Hares love the intensity of going full out; tortoises relish the relaxed groove of a meditative pace.Both types of exercise have proven benefits. Problems can arise, however, when you stick too closely to one type of workout or the other. That’s because your body runs on three separate but interrelated metabolic engines: the aerobic, the glycolytic and the ATP-CP systems. (For more on these systems, see ELmag.com/energysystems.) Each is built to power you through a different type of exercise.Slow and steady long-distance exercise uses primarily the “aerobic” system.

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Three-Speed Cardio : Experience Life

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