Leg Raise with Slow Drop - HIIT Exercise – Group HIIT
Lay on your back, point your toes and raise them until they are about a 90 degree angle to the floor. Next, flex your feet and lower as slowly as you can. Raise again just before your heels touch the ground.
High-intensity interval training - Wikipedia
Leg Raise with Slow Drop - HIIT Exercise – Group HIIT
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