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:
Put your weight on your hands and move your knees towards your elbows in a jump. Put again your weight on your hands and straight your legs out behind you in another jump.
TIPS: Make sure your shoulder blades are always retracted. The exercise key is quality over quantity. The trick is to perform the exercise using proper form. Don't let the hips go down, specially when you put your feet behind you in a jump.