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To double your calorie burn, "replace five-minute chunks of your usual loop with these gradual walk-to-run intervals," Cole says. In 20 minutes you'll torch 147 calories instead of 70.
| Minutes | Activity |
| 0:00-5:00 | Walk at a moderate pace to warm up. |
| 5:00-10:00 | Repeat the following cycle five times: |
| 10:00-12:00 | Walk briskly. |
| 12:00-17:00 | Continue walk-jog-sprint cycle. |
| 17:00-20:00 | Walk briskly. |
Repeat if you have time for a 40-minute workout. |
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