… then raised her left foot, gingerly keeping her balance. “Time to let go of my hand,” said Dr. Prue Plummer , a professor of physical therapy and Multiple … relapsing remitting Multiple Sclerosis in 2005, followed the instructions. Then it was time for LaSpina to switch most of her weight to the right side, the one more affected by her MS. “Oh, my goodness,” she said. “This is harder.” Plummer then had LaSpina close her eyes, …