Bend your knees so your feet are flat on the floor with heels under knees and toes raised.
Place sliders under your heels. Perform a posterior pelvic tilt (flatten your lower back against the ground).
Push through your heels into the ground, lifting your hips up to the point where there is a straight line from your chest to your knees.
Extend your legs in a slow, controlled manner, to lower your bum to the ground.
Casually bend knees before repeating.