When I first started playing lacrosse at 12 years old, I was a defenseman, and I still remember the moment I got the ball, ran it up to the midfield line, and then—bam—it felt like I hit a brick wall. I froze, completely unsure of what to do next, even though I understood it in practice and could explain it perfectly on a whiteboard, because we had never actually practiced it in a live-game scenario.