It’s Wednesday night, and under the flourescent lights of Lied recreation center, rugby teammates line up parallel to each other. On the coach’s call, one charges toward the other and hooks an arm under a leg while thrusting a shoulder into the torso — the teammate is pinned to the ground. They get up from the turf laughing, the charger helping her teammate up. Then they switch positions, the charger preparing for a turn as the tackling dummy.