Run a mile. Do 100 pullups, 200 pushups, and 300 squats. Then run another mile. That’s Murph. Arguably CrossFit’s most famous (or infamous) WOD, Murph is the ultimate test of cardio endurance, bodyweight strength, and sheer mental fortitude. Getting through 100 pullups alone is impossible for many hardened gym-goers, let alone running a mile after…