1. Start on all fours (quadruped position) with the head, neck, and spine in neutral position, the hands under the shoulder and the knees under the hips. No flexion, extension, lateral flexion, or rotation in the neck and spine.
2. Kick one leg to the rear until you reach full extension.
3. Return to starting position. Complete al repetitions on one leg before switching legs.
Primary: gluteus maximus
Secondary: Hamstring (biceps femoris, semitendinousus, semimembranosus) Erector spinae (spinalis, longissimus, iliocostalis), adductor magnus, adductor longus adductor brevis, gluteus medius, gluteus minimus,