Begin quadruped, working leg lift once, hydrant once, turn over the supporting side, double leg extension.
Options for advancement: Seated leg extensions/lifts, quadruped advancement
Begin in clam shell, turn onto the abdominals hamstring curl to lift supporting leg, extend both legs lift into a high plank.
Options to advance at the end: Clamshell advancement, spinal extensor advancement, plank advancement with a focus on glutes
