The more relaxed you are, the better those brain waves work...
Each Mindball player wears a headband that provides EEG (electroencephalogram) feedback by measuring the electrical frequencies of the brain.
Certain frequencies of signal are associated with different mental activities--for example, gamma waves with a frequency above 26 Hz are associated with higher mental activities such as problem solving.
To win at Mindball, however, you need to produce theta waves (4-8 Hz) which are associated with drowsiness and alpha waves (8-12 Hz) which are associated with being relaxed. So the more relaxed you are, the better you're going to be at this game.
The benefit of these sorts of games is that they give you tangible evidence of what you can achieve. The trick is to register what you are doing and feeling, so you can work towards regaining this ability at will, even when you're not receiving the sort of feedback that a game like Mindball provides.
Knowing you are capable of this sort of concentration is very reassuring, and is relevant to many areas of life, from school to work, exercise to relaxation.
Even winning the game!