OT 2019, or Organized Team Activities 2019, refers to a series of voluntary training sessions held by professional football teams in the National Football League (NFL). These activities typically take place in the offseason and allow players to practice together, learn new plays, and build team chemistry. During OT 2019, teams can conduct drills, meetings, and workouts, but contact is limited. The sessions are crucial for rookies and veterans alike, as they help players prepare for the upcoming season and establish relationships with coaches and teammates.