Come into a plank position with wrists directly below shoulders and feet hip-width apart. Bend your elbows and lower your body down until chest is hovering above the floor.
Without arching your back, press yourself back up into a straight-arm plank. Shift weight into right hand as you rotate onto the sides of your feet. Bring left arm straight up above the shoulder. Keep hips lifted.
Return to top-of-a-pushup position and repeat the movement on the opposite side. Once you've done a side plank on both sides, perform a pushup. That's one rep. Do 10 reps total.