HIIT Treadmill Workout — Adrien Petersen

Short on time but need to get some cardio in for the day? This is the perfect work out for you if you enjoy running. HIIT means high-intensity interval training which is a type of exercise made up of alternating periods of short, intense anaerobic exercise with less intense recovery periods. It is efficient because an entire HIIT session lasts only about 10-20 minutes. This type of workout is great for burning fat, and your body continues to do so for 24-48 hours after your workout.
How to:
5 mins - 7 (speed of treadmill)
5 mins - 4.5
4 mins - 7.5
4 mins - 4.5
3 mins - 8
3 mins - 4.5
2 mins - 8.5
2 mins - 4.5
1 min - 9
1 min - 4.5
5 mins - 3 (cool down)
Modification: to shorten this workout from 30 to 20 minutes, start at 4 mins on speed 7 and work up to 8.5