A Kick-Your-Own-Ass Treadmill Workout - No Trainer Needed

Increase your endurance, raise your heart rate, and rev your metabolism with this interval workout. This ladder run - with the speed intervals increasing in duration as the workout progresses - is designed to push you out of your comfort zone to burn some serious calories. If this is not your pace, no worries! Find a speed that works for you, but keep the timing and increases in pace the same.
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