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Muscles keep our skeleton in place. Without muscles we would not be able to keep ourselves upright, and moving would be impossible. Men are genetically endowed with more muscle tissue than women, and for this simple reason a man and a woman training with the same intensity will never be equally strong or fast. But how come that is it genetically set whether a person (man or woman) is physically talented to be either a sprinter or a marathon runner? Either a judoka or a long distance swimmer? A discus thrower or a cross-country skier? Why do bodybuilders appear strong as a horse while your average weightlifter, who looks like he spends too much time observing the interior design of MacDonalds, can easily lift three times the weight a bodybuilder can.? And why do bodybuilders suck at riding the Tour de France? To understand how muscles and various training principles work it is necessary to look at muscles from a physiological point of view. Skeleton muscles (which are the kinds of muscles discussed here) are the muscle covering the skeleton. Each muscle is attached to bone by two tendons. Watching Robbie Williams’ video for ‘I don’t wanna rock, DJ’, were Robbie, after having taken of all his clothes starts to undo himself