When the desire of our mind is for the greater strength of the body, during the time that we need to overcome the opponent by training, naturally the mind will focus. This is the "only" purpose of having a tournament. Rather than confronting the challenge from the opponent, it is a mean to confront the weakness of our mind.
Only the hardest "yang" would breed the softest "ying".
Therefore during the time when our mind is in intense focus, then the pathway to deep meditation is formed.
Meditation is not sleeping, but is the tiresome task of mind focusing. It requires stamina, and strength.