Take a look at Ben Johnson’s world-record-breaking 100-meter sprint. Although temporary in the record books, his performance was nothing short of outstanding. No doubt, Ben Johnson is one of the greatest sprinters of all time — and his coach, the late Charlie Francis, was one of the best in the business.

If you watch Johnson’s face throughout the race, it stays relaxed — mouth soft, forehead smooth, and cheeks swinging gently side to side. That’s exactly what Charlie Francis advocates on page 13 of his classic book Training for Speed.

There’s a reason sprinters are told to relax their face: it improves performance.

But it doesn’t just apply to sprinting…

Relaxing your face can improve your ability to lift weights as well. Not only can it help you lift more weight, but it can also improve your flexibility.

Don’t believe me? Check out this video with legendary strength coach Charles Poliquin:

When you release tension in your jaw, tension throughout the body also releases. The result? An instant gain in flexibility and a smoother, stronger lift.

Now, imagine clenching your teeth during every rep — not only can it wear down your teeth (which is why some people wear a mouthguard when they train), but it can also make your entire body stiff and restrict performance.

Take-Home Message

To maximize your performance in the gym — lift with your muscles, not your face!