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>> your first response? >> my first response, i said are you crazy? >> reporter: but he did go for that run, and he felt something go click. >> it was the first night that i slept in about four or five months. >> is that right? just getting a little bit of exercise in? >> four times around, i slept. >> reporter: in fact, he was running so much he developed an overuse injury, so dr. maroon started to bike and then swim, and slowly his depression began to fade. >> i started to feel strong again an...

That run. and he felt something go click. >> it was the first night that i slept in about four or five months. >> is that right? just getting a little bit of exercise in? >> four times around, i slept. >> reporter: he was running so much, he developed an overuse injury. so dr. maroon started to bike and then swim and slowly his depression began to fade. >> i started to feel strong again and was able to get back to neurosurgeriry, get back to my life. >> reporter: thats when he heard about triath...