Former New England Patriots tight end Rob Gronkowski, left, and his father, Gordy, give high-fives Wednesday to children at the Alfond Youth Center in Waterville.

Former New England Patriots tight end Rob Gronkowski throws footballs to children Wednesday at the Alfond Youth Center in Waterville.

Fans of former New England Patriot tight end Rob Gronkowski photograph him Wednesday during a clinic at the Alfond Youth Center in Waterville.

Former New England Patriots tight end Rob Gronkowski signs autographs Wednesday for children who look on in awe in Waterville.