High Intensity Interval Training: Sprint Interval Workout: "This sprint interval workout is a type high intensity interval training (HIIT) that helps build endurance, increase your anaerobic threshold and burn more calories and fat both during and after your workout. For this workout, you'll have a longer warm up (10 minutes) before going into 4 all-out sprints at a Level 9 on this perceived exertion chart for 30 seconds each. Between each sprint, you'll recover at an easy pace for 4.5 minutes, giving you plenty of time to get ready for the next sprint. "
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