Follow-up exercise to further practice the triple extension pattern under more strenuous conditions.

The elastic band puts further emphasis on the hip flexion capacity of psoas muscle (therefor flexion should go above 90°).

By changing the stance leg, an additional perturbatory element is generated, the need to create a sufficient force fast in order to stabilize the body in verticality is asked for. Multiple types of sensorimotor input have to be coordinated and integrated to ensure movement execution.

Re-assess integrity of the goal-posture after each rep. Movement execution should be as fast as possible.