The NHS choices website is full of useful health related information, including lots of advice for people with a disability. Here’s a good example:
Keeping fit with a disability is easier than you may think. Fitness instructor Mike Lee explains why exercise is important to help prevent obesity and cardiovascular disease. He also gives tips on how to find the right gym or what to do from home if you don’t want to pay for a gym. Also watch other disabled people describe why they want to keep active.