
The step-down works the quadriceps by controlling the descent on one leg.
Stand on a step or a low box on one leg, with the other foot hovering in front or to the side.
Bend the supporting leg to lower slowly until the free heel lightly touches the ground, then push back up.
The supporting knee stays in line with the foot and the pelvis remains horizontal.
Image and text: Bryl Lim / Everkinetic — recoloré et rastérisé — CC BY-SA 4.0, via Workout Guide. Original entry