Abstract: A release key for adjustable track hurdles having telescoping members with a biased detent locking assembly located within a pair of longitudinal telescoping members, wherein the detent extends outwardly through aligned apertures in the telescoping members to selectively lock those members in predetermined longitudinal positions. The key features a pressure plate having inner and outer faces, with the inner face having an inwardly extending release protuberance and shaped portion which corresponds in conformation with at least a portion of the outer surface of the telescoping members. The outer face preferably includes a handle to further facilitate manipulation by the user, and the release protuberance is aligned with the biased detent in use and extends at least partially into the aligned apertures when its inner face is placed in contact with the outer surface of the telescoping members.