Soccer might be one of the hardest sports to train for. Players need endurance to run for 90 minutes, with only one 15-minute break. And in the World Cup knockout rounds, if there is a tie, match time could extend to 120 minutes. Over the course of a game, the average player runs between six and eight miles. But endurance is just a piece of the puzzle. Players also need to be capable of explosive acceleration, quick stops, jumping, and have a surprising amount of upper body strength.  Plus, socc