[Mark1808]

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I don't think extreme flexibility necessarily helps a swing...in fact, I think it mostly hurts it since the best swings tend to be relatively compact. Mostly, I think that you are fine as long as you're not inflexible...as long as you're 'normal', there are more important things to focus on.

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PGA Tour players on average are much more flexible than the average person as tested by a seating excercise where one twists their upper body around as much as possible. (John Daley is extrememly flexible) I believe length comes from speed (core srength) and not muscle strength. Compact swings from good players usually are full shoulder turns with short arm swings. Swings from hacks that look long are usually poor turns accompanied by a lifting of the arms.