Lie supine on platform with shoulders against pad. Place foot slightly low on platform. Position other leg with lower leg parallel to platform.
Push platform by extending knee and hip until knee is straight. Return by bending hip and knee of supporting leg until knee is just short of complete flexion or until hip is completely flexed. Repeat. Continue with opposite leg.
Allow for full range of motion without forcing hips to bend at waist. Keep knee pointed same directions as foot. Do not allow heel to raise off of platform, pushing with both heel and forefoot. Placing foot slightly high on platform emphasizes Gluteus Maximus. Placing foot slightly lower on platform emphasizes Quadriceps.