From among the exercises that Pittsburgh Steelers linebacker James Harrison posted to Instagram last week, we bring you the Physioball Side-to-Side Bridge, featured below.
It strengthens the posterior of your core, including your back and glutes. By shifting side to side, you force your body to prevent rotation, increasing core stability.
Check out the video playlist above for a bonus video of Harrison doing Push-Ups with a 300-pound lineman on his back.
Photo Credit: Getty Images // Thinkstock