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My daughter, Kelly, broke her back doing that very thing at Lake Powell, four years ago. All fun until that happens. I wasn't there at the time and it was a tense few weeks.
Sorry to hear that, Larry. Hope she's better now.
She had a 6 month old nursing baby at the time (being tended to by people on a houseboat who were part of the trip). She still suffers from it but no longer wears a brace.