What does it feel like to jump off of a cliff into water?

I've never jump into water from the height of more than two feet, but people say it hurts to jump into water from very high up. What kind of sensation/pain is it?
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How about those guys that climp the really high ladder to jump off of a tiny diving board into a little kiddie pool. I forgot what those are called, but how come they never get hurt especially since the water is so shallow?
What does it feel like to jump off of a cliff into water?
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