Arguably the fastest man in football, Tennessee Titans running back Chris Johnson has the ability to change an entire game in a split second. And we actually mean one second. Cj2K runs an astonishing 4.24 40, has a 35-inch vertical leap, and a 130-inch broad jump. The 2009 season became Johnson's breakout year, rushing for more than 2,000 yards and was named NFL Offensive Player of the Year. Men’s Fitness doesn’t just profile anyone’s workout regimen. No, they need to have a reason. And if CJ’s explosiveness and lightning-quick speed isn’t a good reason, then we don’t know what is. He maintains the speed that helped him to break the NFL single-season record for total yards from scrimmage (2,509) with a mixture of single-leg squats, reps on the Vertimax, and a variety of other explosive exercises. You, on the other hand, might want to work on strengthening your eyes for the 2014 season. Otherwise, you’re likely to miss Johnson streaking across your television screen as he shreds another defense.