Position yourself with your elbows under your shoulders. Feet together. Exhale, pull your bellybutton in toward your spine and lift up so you are balanced on your elbows and toes. Looking at the floor to keep your neck in line with your spine.
Keeping your core engaged, lean toward your left elbow and reach your right arm out extended.
Return to the starting position, staying on your elbows and toes. Core still contacted.
Now repeat the movement to the opposite side, extending the left arm and reaching to the left.