c.p.e that affects roughly three-quarters of a million americans. hunter wants to raise awareness about c.p., and is in the middle of carrying braden 40 miles on his back from their hometown of temperance, michigan, to the university of michigan in ann arbor. >> i think it will be great. it's going to be hard for me and hunter, but i think we can do it. >> reporter: hunter hopes to encourage new ideas to help people with c.p., in particular, a way to make it easier for people like braden to get around. >> he has trouble just going through grass, gravel, mulch, snow, sand-- i mean, we're hoping to get something more all-terrain. >> axelrod: they got a rousing send-off at the start this morning, joined by about 50 friends and relatives for the first part of their walk. hunter and braden made it three miles before making their first rest stop. >> feel pretty good. >> reporter: at mile six, they paused to stretch. hunter may be carrying braden, but braden is lifting hunter as well, in his own