Wanted to share this bike info in case in might be helpful for someone. My son has spastic diplegia and he's 9 years old. He was using a bike with training wheels, but never liked it too much, because the training wheels threw him off balance. We looked around for a recumbent bike, but the cheap ones had bad reviews on durability and the next ones up were way more expensive than we wanted to pay. My son's PT suggested buying fat wheels (you can get them online), which are as thick as bike tires but less than half their size in diameter. We bought them for $100 and attached them to his bike...instant success! He LOVES to ride his bike now, and is getting such good exercise. We take him to a walking/bike trail that is long and fairly flat.
We were extremely lucky in finding the perfect customised "Discovery" bike made by Freedom for him. It is a Canadian company. It cost $5000 but we were very fortunate to have it funded for him by a local charity. He now has the freedom to ride to school, supervised by me and it is fully adjustable so will fit him for years to come. Love the joy felt by giving him that little bit more independence. He is also spastic diplegiac.
I am 25 years and I always wanted to be able to ride a bike for exercise purposes to keep myself fit, but my problem is that I can't fully flex my feet to make the pedals fully rotate or "go" because of my CP. I know there is three wheel bikes out there that have bars that can propel the pedals by hand. I don't want that type of bike though, because I want one that strengthens my leg muscles. So, my feet are actually doing the pedaling just with some assistance.
I'm happy to report that we bought a pair of fat wheels (they work like training wheels, except their twice the size and are more stable). He now LOVES to ride his bike, and it's really helping his calf muscles grow stronger!