100-200 m, or up-down stair 2 room then also does not affect the heart too much. Does not help to reduce belly? Run 1.5 miles in 8 minutes, began to affect the heart but also not reduced belly. Continuous, non-stop run 12 minutes cardio and have an impact on reducing belly. Continuous, non-stop run for 30 minutes or more to affect the heart, belly reduction clear.
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