tom was getting confused. he's sharp. he laughs. he makes jokes. >> narrator: for the shearers, fighting the battle is about making adjustments. >> i think this is just if you're filing electronically. >> narrator: tom used to be a tax attorney, but madeleine now files their returns. >> okay, missed your foot. that's it. >> narrator: watching tom and madeleine shearer, i think back to my parents, the adjustments they made-- little things, like the difference a shoehorn can make-- and that even as speech becomes more difficult, it still only takes a few words to sum up how best to face the future. >> shoes on again. >> yup. >> narrator: "shoes on again." the day after i got my diagnosis, i began an exercise regimen, mostly just because i wanted to feel like i was still in charge of my own body. and the more i learned about exercise, the more hopeful i became. research at one location was particularly intriguing, the university of pittsburgh and the lab of dr. michael zigmond. >> parkinsonian researchers are sort of late in the game of being interested in exercise. people interes