We’re all for trying new workouts, but the chair traverse—a fitness challenge where you sit in a chair, slither between its legs, and return to a seated position, all without touching the ground—is a surefire way to end up with bumps and bruises. The ninja-like move started as a training exercise for intense rock climbers, but now people all over social media are trying it out. There haven’t been reports of serious injuries—yet—but anytime you fall on your head, you risk spinal injury.

So if you can’t do it as flawlessly as this guy, sit this one out:

Still not convinced? Watch this cringe-worthy attempt: