Sebastian Pacey-Smith, a rock climber from New Brunswick, Canada, has added to his grip strength credentials by breaking the world record for 1-Arm Rolling Thunder pull-ups—raising the bar to 4 reps.

Pacey-Smith’s world record represents a mind-numbing level of pull-up power, with the added challenge of hanging on to a Rolling Thunder while doing the pull-ups.

Pacey-Smith said he “has always been very motivated to push [my] limits in training and climbing hard outdoors. [I] initially started competing in gripsport in 2024 and went on to win [my] weight class at the World Armlifting Championships in Las Vegas in 2025.”Armlifting began as a single-event competition featuring the Rolling Thunder and has evolved to include multiple events.

In terms of the future, Sebastian said he’s “looking forward to continuing progressing in grip and in climbing hard boulders.”

Here is a link to the video of Sebastian Pacey-Smith’s world record for Rolling Thunder 1-arm pull-ups.

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