In this March 8, 2017 photo, Steve Johnson who is battling Parkinson's disease works on his technique as part of the he Rock Steady Boxing program at CrossFit 309 in Peoria Heights, Ill. The Rock Steady program is growing, offering people with Parkinson's a way to push themselves to fight back against the disease by boxing. This year, they've expanded to more classes, moved into their own dedicated space at CrossFit, and just recently installed a professional boxing ring.(Fred Zwicky/Journal Star via AP)
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