Sleep problems, memory loss and fatigue are some of the possible symptoms of Parkinson's along with the typical motor aspects such as slowness or tremors.
The Greggs are sharing their story through a reality-style video series that is part of "Parkinson's More than Motion" Facebook community and follows the couple as they cope with the disease and its treatment.
"I'll tell you what, it's emotional. You have to fight getting down," Gregg said. "And I've been on the physical regimen. In fact, I think I was working out too much. I forget I was 79 instead of 39. And so I had to back off a little bit and now I don't worry if I miss a day working out. The main thing is to continue to work out, try to keep a good attitude."