Avoiding running ’cause it always gives you a stitch? Good news! This fix is so simple, you’ll be lacing up your takkies tomorrow.

You know the feeling only too well…you’re on track for a PB in your five-kay. Your legs are feeling strong and you just passed that woman with a pram who beats you every Saturday. And then, out of nowhere, you feel a sharp pain in your side. Your try to ignore it, but it builds and twists and next thing you know, you’ve totally lost your rhythm. And that elusive PB. Sound familiar?

Stand Straight, Run Faster

Now for the good news: The fix for your stitch could be as simple as tweaking your posture. Crazy, right? But it’s true. Research in the Journal of Science and Medicine in Sport found that people who round their upper backs are more prone to these crippling cramps and feel more intense discomfort. A hunched posture may compress the nerves that run along your spine and into your tummy, making them more sensitive to pain, says lead researcher Dr Darren Morton. Exercising may irritate those already tuned-up nerves.

READ MORE: Just One Minute of Running Can Make A Difference.

Fix The Stitch

Use these two steps to get rid of that irritating pain and get back on your game.

STEP 1: Do a hunch check: stand sideways in front of a mirror and compare your posture with this diagram. If you line up with the red, your posture needs work.

STEP 2: Need to realign? Gently correct the bend with this stretch: lie on the floor and place a towel folded or jersey to 10cm thick under your shoulders (perpendicular to your spine); clasp your hands behind your head. Lie on the towel for 30 seconds; sit up for 30seconds. Repeat three times.

READ MORE: These Pro Tips Will Help You Ace Your First Race.

Want more? These newbie running mistakes are probably messing with your running game. Use these tips to axe them.