Prepare the BOSU with the flat side up. Take a position leaning on your hands which go perpendicular below your shoulders. Firm up your body core, with pelvis in a neutral position and shoulder blades fixed. Your feet shoulder width apart.
From the starting position, use a dynamic movement to pull your leg and knee to your chest, and back. Switch legs. Inhale in the starting position and exhale with moving your knee toward the chest. Do the required number of repetitions, switching legs dynamically.
Keep your body core firm all the time and do not bend at waist and keep your pelvis in a neutral position.
Pay attention to fixing your shoulder blades to the chest segment of your spine.
Keep your head (neck spine) upright and do not bend it back.
Exercise sideways to a mirror to check the correct technique and eliminate possible errors in the movement.