Putting the punch to Parkinson's

With a glint in her eye and clenched jaw, Tina Schoenherr rears back a gloved fist and swings at the target held up by Anthony Mora. Thuds of fists on punching bags and Mora’s rapid-fire instructions inside the ring – “One-two, Tina! C’mon, one-two!” – fill the basement gym that could easily double as a set for an old-school boxing film, a la “Rocky.” The room pulses with music and motion – mostly middle-aged folks who are strenuously exercising both in and outside the ropes.