The Sport Information Resource Centre
Use double quotes to find documents that include the exact phrase: "aerodynamic AND testing"
The Sport Information Resource Centre

Most concussions in youth volleyball are the result of ball-to-head contacts during practice or warm-ups. To improve athlete safety on the court, Volleyball Canada introduced a new rule in 2018 to prevent athletes from going under the net to retrieve the ball during warm-up drills, a high-risk situation for ball-to-head contact.