Assume a straddle position on the floor, with legs straight. Reach forward with straight arms, onto your fingertips, and drive them into the floor.
Difficulty is adjusted by how far you place your fingertips from your torso.
Appropriate placement should only allow for your heels to lift approximately 1 inch from the floor.
From this position perform raise both legs off the floor, engaging your quads and pointing your toes. Perform pulses, while keeping the legs elevated & maintaining tension throughout the set.