While not rowing, I know lots of rowers have either run a marathon or set the goal of working towards one as part of their training.
The article mentions a few ways of reducing the risk, while at the same time points out that death in marathons at about 1 per 100,000 carries a very low risk, especially when you consider the reduced risk of serious disease seen in runners, compared to sedentary people sitting at home on the couch.
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