Four outstanding, female distance and middle distance runners have joined the Boston Athletic Association, the organization has announced. Elaina Balouris, Juliet Bottorff, and Emily Lipari completed their collegiate eligibility in June, and they will reside and train in Boston, representing the B.A.A. These athletes will join Katie Matthews, another recent graduate who has been training and racing with the B.A.A. since the beginning of this year when she completed her collegiate eligibility. All four women are part of the B.A.A.’s new high performance team and will be coached by the B.A.A.’s Terrence Mahon.