CIF Bylaw 1405.3
A summer dead period must be declared by the school principal for all sports. The dates of the dead period must be forwarded to the Southern Section Commissioner. The dead period must be the same for all levels and must be three (3) consecutive weeks between the end of school or the last Friday in May, whichever is first, and the last Monday in August. No class could be offered which could circumvent the rule. There are no exceptions to the summer dead period. During the dead period, weight lifting ONLY would be permitted. No running or other type of conditioning would be allowed.