My husband rode, and got me into mountain biking. I was GOOD at it, i am pretty athletic, fearless, and tough. If I am good at something, I work at it. I had a stroke in 2007 (January) and was on blood thinners for almost six months while the doctors tried to figure out why a 36 year old, 12 percent body fat, non smoking, non-hormone-taking healthy woman with no family history of stroke would have a stroke. So, because of the blood thinners, no mountain biking. I was going nuts! So I stated on the road bike then, and was hooked. Now, almost three years stroke free, I do both. And I am FULLY aware how quickly your life can change. For me, it took about two minutes.