Punching Pro - a sparring apparatus that fights back

Punching Pro - a sparring apparatus that fights back: "Kris Tressider may not be a boxer, but he is a fitness nut with a background in gymnastics and martial arts. It therefore isn't surprising that some time ago, the Australian draftsman invested in a punching bag to add to his daily workout. It wasn't long, however, before he began to get bored of simply slugging away at the defenseless bag."