Shadow-boxing is a form of physical exercise and training in which a person throws punches and jabs at an imaginary opponent. Sparring is a form of practice boxing in which two people engage in a simulated fight using protective gear. Shadow-boxing and sparring are both used to improve a boxer's technique, agility, and reflexes. The term 'shadow-boxed' refers to the act of shadow-boxing, or throwing punches and jabs at an imaginary opponent.