Stand up straight with your legs hip-distance apart.
Keeping your back straight, bend your hips and knees.
Push through your legs and feet and explode into the air.
Land with your feet wide apart while simultaneously reaching down to touch the floor between your feet with your fingertips.
Explode through your legs again as you jump into the air and land with your legs hip-distance apart.
Repeat, alternating between wide landing with floor touch, and a narrow landing without.