John's contribution to PD group regarding exercise is supported by professionals and research. John having or not having PD does not affect that fact. One example:
walking briskly, can help to improve the symptoms of Parkinson's disease
The walking sessions met the definition of moderate intensity aerobic exercise, with the average walking speed approximately 2.9 miles per hour ....45-minute sessions of moderate intensity walking, three times a week....
The researchers found that the brisk walking sessions resulted in the following improvements:
Motor function and mood: 15% improvement
Attention/response control: 14% improvement
Tiredness: 11% reduction
Aerobic fitness and gait speed: 7% increase.
I support and appreciate John's compassion and sincere concern for the welfare of us that do have PD.
Note: His purpose is NOT to sell his book. He clearly states and if you (the stone thrower) did your due diligence before accusations where thrown, you would see that everything in his book regarding exercise for therapy, is FREE on his web site. Just as he tells all that read his posts.