"I always try to tell people, whatever you can do, keep doing it, keep doing it," she says. "And that's why I do MS. When I start something, I don't want to just quit."
And why the nice dress and high heels? Tsai says that's just her normal biking outfit.
"I went to church, so I always dressed up and would ride my bicycle," she says. "So that's why I do it that way -- I do it that way naturally. That's the way I ride my bike."
"When the last rider comes in, [the MS society] usually has like a police car or fire truck with sirens going off. And usually my grandmother is the last person," says Sim with a laugh. "So the people who know about her, they just sit around waiting for multiple hours after most people have finished. And she'll just ride in, and people are cheering, taking pictures, asking for autographs. It's like being with a celebrity."
"I think because of her personality and her demeanor, it really gives people hope. It doesn't matter who you are or where you're from, as long as you're persistent, you'll be able to come up with a cure," he says. "She's a pretty remarkable woman. And I'm just hoping the genes pass down."