Carrie Kahl wakes up around 6:15 a.m. nearly every day and goes downstairs to see her sons. Then, she waits. At about 7:30 a.m. they are ready for breakfast, then a few adjustments and they're out the door. Kahl's twin boys were diagnosed at age 5 with Becker muscular dystrophy, a genetically inherited degenerative disease that weakens the muscles. "We were told they wouldn't need wheelchairs until they were 40," Kahl recalled. "They were 11."