I have spent years in and out of the gym, trying the latest fitness trends. Consequently, my social media feed often populates with shirtless, sweaty men promising to transform my workouts.
Then it started. First, it was the occasional video of athletes grinding through a series of herculean tasks: pushing plate-laden sleds, collapsing over rowing machines, sprinting laps and throwing weighted balls at a wall inside of what looked like an aircraft hangar. That trickle became an avalanche, and I became curious.
