Cycling maybe just a hobby for us, but for others the battery power of an e-bike has transformed their lives - enabling them to cycle when they otherwise couldn't, find new career paths and improve their mental health.
10 years ago, Doctors told Tim Gregory he had two years to live and he began using an oxygen tank to manage the disease. He says about 75% of his lung surface became scarred from fibrosis.
Tim, who had ridden since the age of 13, gave up cycling as he struggled to breathe.
"If you could imagine riding your bike with a tennis ball in your mouth and how that would affect your breathing then you're getting there."
Then Tim bought an e-bike and enjoyed riding off-road trails with people he has not been able to cycle with in 10 years.
He has even switched careers as a result and now sells e-bikes to help others like him.
This and other stories can be found here: https://www.bbc.co.uk/news/uk-england-norfolk-48204409