if you work hard on the heavy bag that is one of the best workouts you can do to lose weight. but that involves moving around the bag, throwing fast hard combinations, head movement, some rounds of non-stop punching, etc.
Any sort of exercise burns calories. The length of time and intensity of the activity is what determines how much you'll burn.
tis true, you can burn calories from walking, or running long distances. just make sure your heart beats per sec are high, because that will improve your stamina and burn more calories. its a sign of you working hard.
Diet, Diet, Diet. For those of you wanting to lose weight. The major factor is what you fuel your body with.
Any physical activity burns calories, the act of taking a single step burns calories, 4 rounds on a bag will burn calories, depending on your intensity major calories can be burned
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