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6 Best HIIT Treadmill Workouts for a Flat Bellydecrease the running speed or increase the rest periods. Beginners might prefer brisk walking and light jogging instead of running. To make it harder, extend the high-intensity intervals for an ...
But as well as interval training, sprints and light running shoes, there’s something else that runners need to incorporate to increase their speed, and that’s strength training. To some that ...
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