One Billings man has found his treatment plan especially helpful, as he's been able to literally fight back against his symptoms of Parkinson's Disease. Part of Dan Merry's therapy includes a weekly class called Rock Steady Boxing, a specialized class for those battling the disease. Watch Dan Merry's fight below:Billings man fighting back against Parkinson's Disease"The stimulation of the nerves keeps these nerves active in your legs and in your arms," said Merry. Seeing him boxing, you wouldn't know that Merry was diagnosed with Parkinson's Disease three years ago. While Merry speaks loud and clear now, that wasn't the case when he was first diagnosed with Parkinson's.