An integral part of the BCS education, athletics endeavors to provide students with experiences that will help them mature emotionally, mentally, socially and physically. Interscholastic teams compete against the best ETIAC league teams as well as other independent schools, and while BCS is committed to winning, emphasis is placed on participation, effort, and having fun.

BCS also offers a wide range of intramural sports and recreational activities to ensure all students stay active and learn about the importance of fitness and a healthy lifestyle.

The athletic facilities at BCS are second-to-none among Canadian high schools. The H. Weir-Davis Memorial Gymnasium contains two full-sized basketball courts, a 40-foot climbing wall, and a complete fitness centre. Three international squash courts and Canada’s oldest indoor hockey rink can also be found on campus. Outside facilities include six sports fields, three tennis courts, a running track, and several kilometers of wooded cross-country trails. Finally, a university swimming pool and the local golf course are within walking distance of campus.