Mountain biking was introduced to Belmont Day seven years ago as a middle school club. The club met once a week and was limited to experienced riders who owned their own bike. Despite its success, the program remained an exclusive activity with limited participation. This year, under the leadership of second-year physical education and athletics teacher Alex Tzelnic, mountain biking has grown into a full athletics offering, and, like the rest of Belmont Day’s middle school sports, is open to all students regardless of experience or equipment.