Step-up
A step-up led by the left leg, with the right foot following onto the platform.
Stand upright in front of the step platform with both feet on the floor and your arms relaxed.
Place your whole left foot on the platform. Keep your left knee aligned with your foot and your right foot on the floor.
Press up through your left leg and place your right foot beside the left. Stand upright with both feet on the platform. Then step down under control with your right foot first, followed by your left foot.