The former Cleveland Browns star, who weighed more than 300 pounds in his playing days, showed off his strength and agility on The Rock's NBC show.
Sandy Zimmerman, 42, pumped up fans with an unexpected performance.
These outward displays of strength and grit are aptly called "ninjuries," and are worn as a badge of honor!
After being bullied, she turned her haters into motivators.
Can you have the same level of honesty about your fitness level? It takes time and specific effort to prepare for these types of obstacle course runs. If you did not prepare, bad outcomes are predictable.
A version of this post appeared on HuffPost Spain. Below are some spectacular images from the 10k race. Sorry, but comparatively
Will Dean, founder and CEO of hardcore obstacle course Tough Mudder, joins HuffPost Live to discuss entrepreneurship, athletics and much more.