Hip hinge in lunge position ("Hip hinge, split stance" Posterior chain strengthening, rocking torso)

Step out to a wide lunge position, and lean your body forward, keeping your back straight.
Bring your elbows to your sides and squeeze your shoulder blades together.
From this position, rock your torso forward and then back to the neutral position.
Keep your shoulder blades squeezed together, and feel the tension through your spine, hips and legs.