My 3 maine drugs are NUTRITION, SLEEP AND EXERCISE along with a wild sense of humor and a positive attitude and an occasional margarita. They help my body stockpile dopamine. Having 20 years of PD, my husband and I rode a tendem recumbent bike across Iowa (RAGBRAI) this summer - 442 miles/over 14,000feet elevation/7 days. To do this,, we put in 1000miles of training. I credit my husband for "pushing" me to my limits. We continue to pedal together every morning but now we do it indoors on a stand. Check out "forced exercise" by Dr Jay Alberts.
TG