As Ufford can tell you, the world of CrossFit has in a few years’ time evolved from a niche subculture into a larger subculture populated by people with disposable income. Nothing says the verge of mainstream acceptance like having major corporations market to you with the Manning brothers. So here are Peyton and Eli slapfighting through a workout run to help Reebok appeal to the Crossfit crowd. Of course, Crossfit is more than just running, which is all the Mannings are doing here, but Peyton’s not putting the neck at risk with anything more strenuous. Eli, on the other hand, doesn’t have to work out to keep this body. Just one of the lucky ones, I guess.