A mother of two is training for the London Marathon and raising money for kidney disease research after she went under the knife two years ago and donated her organ to a complete stranger.

Rachel Cox, 48, a nurse on the renal unit at Crosshouse Hospital in Scotland, said she was moved to help after watching her patients suffer the harsh side effects of dialysis, SWNS reported.

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“A life on hemodialysis is not easy and it’s not really a choice,” she told SWNS. “It’s something is every day and I wanted to do something to make at least one person’s life better. You can only give your kidney once and that’s why I couldn’t choose who to donate to.”

Cox, of Ayrshire, said her family thought she was “crazy,” but that it was a “personal choice and not something anyone should feel pressure to do.”

Cox had to undergo a psychological evaluation to ensure that she was donating for the right reasons, and said she wasn’t public about her decision at the time because she didn’t want to pressure any other nurses in her field.

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She has since recovered from the surgery and is raising money for Kidney Research U.K.