Toughest sport to play

[Steve09797]

marathon running basically uses only one energy system, (oxidative) rugby uses two of the three. there are short bouts of anaerobic energy and also endurance plays a huge factor. 40 minutes of non stop running, including hitting and tackling without any equipment is pretty damn tough to me. so marathon runners run for a long time, they are not using any other energy system (except maybe a sprint at the end) I agree with you jonny c , rugby is the toughest