By training your character, you will have a bigger chance of winning a fight or defending yourself from some notorious villains or different gang members. You can start training at the local gym and increase your three features: strength, defense, and speed. The higher the level of any of the three skills, the better chance of winning in battles.
Training uses player energy and happiness points. Players have to choose the workout, that makes this type of player progression meaningful.
The success of a training session is defined by players training skills that can be seen in the status bar.