ehh, i donno about muscle "length". i believe mass has very little to do with endurance. for example, at 185 pounds and 5'11", i would have a considerable amount of mass. however, i exclusively train for endurance. professional bike racers have HUGE mother****ing legs and train for having legs capable of ridiculous power output for hours.
that being said, there are fast twitch and slow twitch muscle fibres. fast twitch is for explosive power, whereas slow twitch is endurance. in your example, you stated that boxers have no bicep peak as a result of endurance training.

in this picture, cotto and mosley both have bicep peaks. there is no straight line from shoulder to elbow.
now, hypertrophy is where a muscle grows larger, plain and simple. endurance training is not targetted to cause hypertrophy; however in the case of the boxer, and the cyclist, they have larger muscles than the marathon runner. why is this? i can only assume that as a result of fast-twitch muscle fibre training (check out olympic lifters, those guys know a thing or 2 about explosive movement), hypertrophy may have more of an inclination to occur.
as you said the "longer" (which can only assumed to be slow twitch) muscles are more favourable, but i would have to disagree. http://www.youtube.com/watch?v=dDy41yxwbb0
here's mike tyson, big ****in guy. he is a prime example of a large guy rockin the fast twitch hypertrophy. thomas hearns, lean dude rockin the fast twitch, but with considerably less mass.
now factor the body builder with "Big bulging muscles" in. he is probably slower than a mother****er (unless he's been doing olympic lifts) as a result of not training fast twitch muscles. what is more explosve, a clapping pushup, or a ridiculously heavy bench press (primarily to induce hypertrophy)? of course the clapping pushup. those kinds of bulging muscles are useless and slow, but someone with tyson's size has the explosive power necessary for boxing. then theres the strongmen who do the slow lifts and also are faster than a goddamn cheetah... but thats another realm of exercise.
anyway i hope i illuminated fast/slow twitch muscle fibres and if i said anything wrong correct me.
that being said, there are fast twitch and slow twitch muscle fibres. fast twitch is for explosive power, whereas slow twitch is endurance. in your example, you stated that boxers have no bicep peak as a result of endurance training.

in this picture, cotto and mosley both have bicep peaks. there is no straight line from shoulder to elbow.
now, hypertrophy is where a muscle grows larger, plain and simple. endurance training is not targetted to cause hypertrophy; however in the case of the boxer, and the cyclist, they have larger muscles than the marathon runner. why is this? i can only assume that as a result of fast-twitch muscle fibre training (check out olympic lifters, those guys know a thing or 2 about explosive movement), hypertrophy may have more of an inclination to occur.
as you said the "longer" (which can only assumed to be slow twitch) muscles are more favourable, but i would have to disagree. http://www.youtube.com/watch?v=dDy41yxwbb0
here's mike tyson, big ****in guy. he is a prime example of a large guy rockin the fast twitch hypertrophy. thomas hearns, lean dude rockin the fast twitch, but with considerably less mass.
now factor the body builder with "Big bulging muscles" in. he is probably slower than a mother****er (unless he's been doing olympic lifts) as a result of not training fast twitch muscles. what is more explosve, a clapping pushup, or a ridiculously heavy bench press (primarily to induce hypertrophy)? of course the clapping pushup. those kinds of bulging muscles are useless and slow, but someone with tyson's size has the explosive power necessary for boxing. then theres the strongmen who do the slow lifts and also are faster than a goddamn cheetah... but thats another realm of exercise.
anyway i hope i illuminated fast/slow twitch muscle fibres and if i said anything wrong correct me.
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