The Shin Box is an underrated squat progression in mobility training It teaches the lower body to move through deeper ranges while staying organized through the hips, knees and ankles. Here is what makes it effective: • Builds rotation and mobility through the hips • Opens the fascial front line along the quads and hip flexors • Loads the plantar flexors as the back shin drops toward the floor • Strengthens the quads and glutes in positions that directly support the pistol squat • Conditions joi