For background, Magnus is one of the best rock climbers on the planet. Not a hardcore mountaineer or ultra-runner type of guy. Lean and mean, not an aerobic animal. But he puts himself out there for unusual challenges like arm-wrestling with pros, pull-up contests at Muscle Beach, and some minor military training.

He was invited to attempt the 3-day French Foreign Legion Special Forces entrance exam. They don't F around and he doesn't fake it.