How quickly you can react to something depends on how quickly your brain registers it. The sooner your brain processes a tennis ball flying towards you, the sooner you can move to return it. The faster it sees a cat darting into the street, the faster you can step on the brakes. The quicker it spots a toy on the stairs the more time it has to prevent you from tripping. In short, a quicker brain means a quicker body.
So whether you want to field a ball more cleanly, like Howard, or catch a sippy-cup falling off a table, it helps to have the fastest brain you can. The BrainHQ exercises can help you get there.