About 10 years ago, a neurologist in Holland discovered that about 20% of his Parkinson patients with severe walking impairments could still ride a bike around a jogging track.
Those patients did need assistance mounting, dismounting, and stopping the bike, but once they got some speed up, they could maintain their balance indefinitely.
I perform consciousness research on a daily basis. This most likely relates to masculine left brain vs feminine right brain function.
Similar to what causes car sickness if a person sits in a back seat but not in front. Or sea sickness, the cure which is focus on the horizon.