"Stopping and starting is especially difficult, and both riders really need to be in sync, which is not easy."
That's NPR's Jeff Lunden's take on training for a New York nonprofit that pairs sighted riders with low-vision riders on tandem bikes for free.
NPR's Jeff Lunden has been covering the InTandem program for a while, and he's gotten to know some of the participants.
Maria Dimeglio, for example, has retinitis pigmentosa, a progressive disease that causes blindness, and had never ridden a bike before.
"I was scared, and I had someone talk to me, and I had someone give me some instruction," she says.
"I was happy, and then I came back and I got the bug."
She's now a board member of InTandem, and says it's good for your mental health.
"It is good for your mental health," Lunden says.
"It's teamwork.
It's working together."
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Jim Fruchterman founded the now 24-year-old social enterprise Benetech, a nonprofit tech company that focuses on developing technology for social good. Fruchterman has also launched a new initiative called Bookshare, which is a membership-only crowdsourced online library for people with disabilities.