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For your second question you may want to post on a polar bear club forum or something. I have no idea how those guys condition for cold water swimming and there is probably going to be a ton of good advice on a forum of people who do it all the time.
Cold water causes most people to panic and the heart rate skyrockets, which can cause a heart attack, especially in older individuals.Keeping your heart rate and breathing under control is very important.
Thank you for the replys:)The neck bridges and hanstands sound great!Thank you for that info.
He said HEADstands but you typed handstands. You probably just accidentally did that but just making sure you know.