Stephen is 8 years old with mild mental retardation. He is 4’3” tall and weighs about 200 pounds. He has extremely poor balance, and low muscle tone. He was scared to ride a bicycle. Stephen started out on the least challenging bike with no challenge to his balance and learned how to pedal and move. He was tired after 5 minutes and had to rest. He was extremely happy he could ride the bike and practiced on this bike until he was red faced and sweating. After six weeks he can ride for ten minutes straight and has moved on to a more challenging bicycle.