The scheme has more than 30 adapted bikes including those operated with arms and hands rather than legs.
Steve Houghton said he has trouble walking as his knees were “shot” after spending 34 years serving in the Royal Navy.
Houghton, who uses a bike powered by his arms and hands, said he loved going around on the track.
He said: “Being outdoors in the fresh air, doesn’t matter if it’s rain or shine, it’s beautiful and there’s great people up here as well.
“It’s just perfect, it’s great and all that fresh air in your lungs, you can’t beat it.”
Former PE teacher Ruth Brown got involved with the project after doctors said exercise would help slow down the effects of a spinal condition she had.
“I love coming up here, this group is wonderful as it’s good for social along with exercise,” she said.