Quadriceps

The exercise stretches the quadriceps on the trailing leg. The exercise trains the quadriceps. The quadriceps are expected to work strongly during the squat hold. The movement should produce a strong quadriceps emphasis. The book-based setup is meant to challenge the outside heel, quadriceps, and surrounding lower-body muscles. The dual knee-drive action — back knee down, front knee forward — deepens the quad stretch alongside the hip flexor stretch. Driving the knees forward initiates the descent in the squat. Forward knee travel is part of how the drill emphasizes the quadriceps. Elevating the heels slightly is part of the setup. The quadriceps are one of the primary muscles targeted by the pause reverse lunge. The drill is intended to emphasize the quadriceps. The main expected sensation during the loaded hold is substantial quadriceps effort.