Cycling isn't as technical of a sport when compared to swimming. Swimming is greatly affected by the body's bio-mechanics unlike cycling. True swimmers have a freakish range of motion and this is done by growing up swimming while the body is developing and adapting to the demands placed on it. So if you grow up a swimmer, your body reflects that in it's development.

For people who are fully developed (aka all grown up) there is little to no chance that they will ever achieve that same range of motion. So in a way, it is inherently a bio-mechanical deficiency that we speak of when saying "Adult On Set Swimmer"

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"Train so you have no regrets @ the finish line"