STARTING POSITION:
Lie on the floor face down and place your hands slightly wider than shoulder width apart while holding your torso up at arms length. Support your weight on your toes and hands. Keep the shoulders far from the ears retracting your shoulder blades. Contract your pelvic floor and core while keep your body straight.
MOVEMENT:
Using your glutes, raise your right leg until it's parallel to the floor. Return to the starting position and repeat the movement with your right leg. Repeat the movement for the specified amount of repetitions. Make sure your shoulder blades are always retracted.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.