The drill in the video above may look strange. After all, how often do you see someone lying on top of a medicine ball on the floor at the gym?

Before you knock it, however, you should try it. The drill may help relieve lower-back pain, says Kelly Starrett, author of Becoming a Supple Leopard and creator of MobilityWOD.com.

By placing a med ball, soccer ball, or volleyball under your stomach and breathing in and out, you’ll target the soft tissues of your trunk musculature, he explains. This not only releases tight areas from the bottom of your rib cage to your pelvis, but also resets your spine after heavy lifting days. 

Related: The Ultimate CrossFit-Style Mobility Workout

Find a spot that seems tight or slightly painful? Hit the deeper layer of tissues by contracting your muscles around the ball, and then releasing them as you breathe out. Starrett recommends doing this for 5 to 10 minutes.