re: BJJ practitioners: any concern about carotid artery dissection?

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If you get what I’m saying then it’s not silly at all.

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Well, I would argue the risks you attempted to compare are of different orders of magnitude to the one from the OP's query.

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My brother tore his ACL jumping for a rebound playing basketball.

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Obviously doesn't compare to a potentially fatal injury.

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had a friend who fell off a boat and never came up again.

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That's what life vests are for. I definitely think people are way too sanguine about boat safety. As someone who likes taking dips in colder waters, I've recently been sobered up into wearing a life vest for that, almost no matter, if it's in deeper waters. A friend of mine has a place on a pretty prominent lake in NC, and he pointed out how many people die annually just on that lake. I had guessed the rate was like 1 per 10 years and it's more like 5 per year! And some of them are people like me who jump in and have cold shock or whatever and just don't resurface. Scares the shite out of me.

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We are all going to die. Either wear your body out and enjoy life to the best you can. Or watch yourself grow old and weak while having never experienced the things you might have enjoyed.

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It's obviously all a spectrum. A hand to hand combat sport is not the same as playing basketball. However, I do like your mention of riding in cars. I routinely see people scared of all kinds of really remote risks thinking nothing of putting their kids in a car with a teen driver.