The YMCA of San Francisco builds strong kids, strong families and strong communities by enriching the lives of all people in spirit, mind and body. Join the YMCA of San Francisco for fitness, swimming, child care, camp and family programs. Exercise in our gym, aerobic studio and pools. Volunteer with the YMCA of San Francisco! Every day children and teens lives are changed through the support and comfort of their local volunteers and mentors. At the YMCA, everyone is welcome.