Zap2it.com | Ryan Sutter Running the Boston Marathon for Ethan Zohn People Magazine More than 40 days after receiving the stem-cell transplant from his brother, Zohn said he is gaining strength and has recently started jogging and playing light soccer. "It's not easy, but I'm getting stronger every day," Zohn tells PEOPLE. 2012 Boston Marathon: Ryan Sutter running for Ethan Zohn |