Bratton Fennell, 53, is one of the top-ranked distance runners for his age group in the Carolinas. During his brain tumor treatment, it turned out that getting moving again was the key to his well-being – both physical and emotional.

Bratton’s cancer journey began earlier this year, when he found himself occasionally stumbling while running, and then just walking. In March, he fell and couldn’t pick himself back up. Imaging tests...