Parkinson's patient Tony Pietrangelo poses for a picture following his Rock Steady Boxing class in Costa Mesa, California October 4, 2013. According to the Parkinson's Disease Foundation, research has shown that exercise can transiently increase the levels of dopamine in the brain, which is significantly reduced in Parkinson's disease. The club, whose headquarters is in Indianapolis, was started in 2006 and has 15 affiliates in six U.S. States, and one in Australia. Picture taken October 4, 2013. REUTERS/Mike Blake (UNITED STATES - Tags: HEALTH SOCIETY PORTRAIT)