Highlining is one of those adrenaline-powered sports that makes casual onlookers with even the slightest fear of heights cringe.

Pioneered by the late climbing legend Dean Potter, who recently passed away in a wing suit mishap, highlining emerged on the extreme sports scene sometime in 2012 and has become increasingly popular ever since.

If you’re at all squeamish about daredevil stunts preformed at dizzying elevations in the complete absence or ropes or safety harnesses then you might want to look away because the cringe-worthy footage below shows experienced slackliner Spencer Seabrooke breaking the world record for free solo highlining.

The stunt, which took place on Aug. 2, required Seabrooke to walk just under 250 feet on a slackline rigged across the Chief North Gully in Squamish, British Columbia— a canyon that plunges to depths of nearly 1000 feet.

Somewhere around the 20 second mark, Seabrooke loses his balance only to hang precariously on the line before mustering the unfathomable fortitude required to resituate himself and continue to the other side.