Stand with one leg bent behind you.
Lower until the knee of that leg touches the ground and rise again.
For greater difficulty, avoid leaning forward and avoid bouncing on the ground.
quadriceps · femoral · calves
legs · buttocks · calves · femoral · quadriceps
legs · buttocks · calves · femoral · quadriceps
fullbody
legs · buttocks · calves · femoral · quadriceps