Everyone seems to be worried at there heart rate when doing cardio. The trainers i am with and asscociated with reckons this is old. Most people I see doing cardio now are about intervale training. Go hard for a certain time then rest then go hard again usually for 45 mins. this includes sprints,stairs ,hills circuit I see a lot of bodybuilders on saturday training this way at Kangaroo point so it is not just for runners. Sorry to hijack your log but i thought this might help the IMC guys with there cardio.
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