Lie prone on bench, floor, or mat. Flex one knee.
Test administrator gently pushes heel of bent leg toward buttocks until resistance is felt or partner expresses discomfort. Repeat on opposite leg.
Pelvis should remain on floor with no flexion at hip. If hip flexes while knee is flexed, a tightness in the Rectus Femoris is indicated. Knee should bend freely 135° or heel should touch buttocks.