The infield fly rule is a rule of baseball that treats certain fly balls as though caught, before the ball is caught, even if the infielder fails to catch it or drops it on purpose. The umpire's declaration of an infield fly means that the batter is out regardless of whether the ball is caught.
This type of massage requires an expert. That is because this technique massages your body with more force and reaches muscles and connective tissues on a deeper level.