Practising the Art of TaeKwonDo allows the student to get more disciplined, and to improve his ability to focus on a task.
Serious training (I mean push yourself!) also allows the student to improve his Fitness level in only few weeks.
Finally, at the condition that he wishes to do so, the student will be able to take part in his 1st Sparring Tournament (actual fighting!) after only few months of training.