While any heart-pumping activity helps reduce the risk of heart disease by lowering blood-pressure and bad-cholesterol levels and keeping your weight and body mass index in a healthy range, experts suggest that four 4-minute bursts of intense treadmill sessions (punctuated by 3 minutes of lower-intensity exercise) may be more effective than about 45 minutes of moderate jogging.
So consider taking 4-minute breaks during a typical sedentary day, during which you run in place or do jumping jacks. Or add 4-minute intervals to your current workout, says Wayne
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