I'm no lacrosse guru but I did attend the WILC U-19 tournament near Hamilton Ontario because my nephew made the team. The games were really exciting and I was ASTONISHED at the speed and level of skill the players had, especially the Western Canadian and the Six Nations squads at this tournament. The players on the US team you could tell were good players in a new environment, and that cost them some. But I heard from every single parent of kids on that team they could not believe how far their sons had advanced in one summer of box training and play. Some of those kids are having blow out years in college this spring. One of them is Morgan Cheek at Harvard. I cannot imagine why a kid would not want to play some box. It is fast and fun and it really contributes to rapid stick abilities improvements.