|Function:||Leg Ext (Vertical)|
Stand with feet shoulder width apart.
Squat down slightly with feet flat on floor by bending knees and hips. Jump up and kick back of heels toward buttocks. Land on both forefeet and repeat.
Attempt to increase speed of jumps, keeping landings short. Any hip flexion is largely passive due to Passive Insufficiency of Rectus Femoris during knee flexion while attempting to keep hips extended.