Four-point kneeling. Tuck your toes under. Straighten your knees. Gently contract deep muscles in the front of your spine and lift your lower back to the neutral position. Lengthen your spine.
You should have a straight line from your head to your feet.
Keeping your body in a straight line, bend one knee in towards your chest.
As you straighten this leg back out, bend the other knee in.
Continue this motion at a fairly quick pace as though you are running.
