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You can always find your target heart rate and use a monitor to bring and keep your heart in that zone. And I heard 30min of cardio a day is good for your heart. Also 3500 calories a week = 1lb, so 3500/7= 500. So I aim for 500 calories in 30min. I get that in about 5 times a week. But the bit about "being able to hold a…
