minor league players participate in spring training following a telescoped schedule that generally lasts from march 1–31. at its conclusion, most players are assigned to full-season class a, aa, or aaa farm team rosters to begin the regular minor league season. however, those players deemed unready for a full-season campaign—through inexperience or injury—are assigned to "extended spring training", a structured program of workouts, rehabilitation sessions, simulated games, and exhibition games based in the major league parent team's minor league training complex. if a player is deemed ready to participate in full-season league action, he is promoted to an appropriate-level farm club. when the "short season" class a and rookie leagues begin play in late june, extended spring training players are assigned to those rosters, placed on the injured list (formerly the disabled list), or released.