Place one foot flat on a stable elevated surface, ideally knee height, the other foot flat on the floor.
Keep a tall posture, and lean slightly forward so you can shift most of your weight to the front leg.
Grip with your toes and try to drive your front foot downward, creating tension throughout that leg.
Inhale, brace your core, and push through the elevated leg. Drive the back knee to the sky and come to single leg standing position. Squeeze the glutes to help you stablilise.
Pause at that top, and then try to control the descent. Repeat for repetitions and then switch sides.