MLB now has 30 clubs spread throughout the American and National Leagues. In addition to the main leagues, numerous cities and towns in North America have minor league clubs. These teams provide an opportunity for young players to advance their careers and make more money. A minor leaguer can often be drafted by a major league club but may or may not sign with one of them. In fact, most minor leaguers don't ever sign with a major league team. There is also a role called "personal trainer" that is played by non-players who work with major league players on their fitness and strength training. Personal trainers are usually former major league players themselves who receive assistance from coaches in performing their duties. The MLB season consists of about six months of regular play followed by another six months of post-season action. The regular season begins after the conclusion of spring training which is held throughout February and March. There are several different types of games that are played during the course of a season. They include: opening day, closing day, weekday games, weekend games, and postseason games. Opening Day is the first game of the season and it always kicks off a new campaign for each team. It is played under the official name "Citizens Bank Park".