The two hardest sports on the body are i think lacrosse and soccer. Think about it. In soccer most of the players stay on the field with absolutely no stoppage in play for 2 halfs of 40 minutes each. They sprint for say one fourth of that in bursts and sometimes half to exert full energy in order to get to the ball. They do this many times during the game. Also during lacrosse you run up and down the field almost as much and soccer and lacrosse also have a physical aspect to there games as well