Competing in a roller derby, trimming cow hooves, and running a half-marathon--harder than they look? Andrew Younghusband takes on grab-bag challenges after minimal training, trying to best his own mother in the half-marathon. Will he skate circles around the competition or hear his mother's dreaded words, "I told you so"?

Competing in a roller derby, trimming cow hooves, and running a half-marathon--harder than they look? Andrew Younghusband takes on grab-bag challenges after minimal training, trying to best his own mother in the half-marathon. Will he skate circles around the competition or hear his mother's dreaded words, "I told you so"?