Earning another goal for her team, Abby Schmidt, 11, heads the ball off of a corner kick. In their game against Centennial, three of sevens goals scored were headers. Heading a soccer ball in one of the leading causes of concussions in youth sports, and some players are aware of the risk. "I try not to head the ball as much," Hannah Goodman, 10, said. "I haven't gotten a concussion, so I guess it's working."