A few years ago, the organizers of one of the largest U.S. exercise programs for people with Parkinson’s disease realized they had a problem: Most of the students were white.

This story also ran on . It can be . “We’re always asking who’s not in the room, and why are they not in the room?” said David Leventhal, program director for Dance for PD with the Mark Morris Dance Group in New York City.

Leventhal and his team went to work. They hired more instructors who spoke Spanish or Mandarin and translated marketing materials, which boosted the number of participants from Hispanic and ethnically Chinese communities. But efforts to recruit Black participants haven’t been nearly as effective, Leventhal said.

Exercise is considered , with studies showing it can alleviate symptoms of the disease and improve mobility, flexibility, and balance. But people who run Parkinson’s exercise programs in a handful of U.S.

cities describe great difficulty in recruiting Black people. “In Parkinson’s, movement is medicine. So if you’re not figuring out how to engage communities in movement, it’s basically like withholding medication,” Leventhal said.

“If this were a pill, there would be an uproar.” A by researchers at Yale showed that after six months of exercise, participants’ dopamine-producing neurons — the kind destroyed by Parkinson’s — grew healthier. Subscribe to KFF Health News' free Morning Briefing.

Research published by a British medical journal this .