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THE GLANCE-OFF is even more important than the parry in causing deflection. The guarding positions of your hands and arms, and the hunched left shoulder in your normal punching stance were designed to give the upper portion of your body a wedgelike effect. That wedging of hands, arms, shoulder and forehead should enable you to (1) keep inside an opponent's attack as you step in to lead or to counter, and (2) cause most blows to glance off to the sides or up into the air. The glance-off is more dependable than the parry because there's more solidity, if necessary, in the glance-off 1 than in the parry. The reserve solidity is there only in case your glance-off has to be turned into a block. However, the less solid the glance-off, the less your own balance is disturbed. Your glance-off movements are not the solid, chopping movements of hand or arm blocks; they are lightning, knifing or sliding movements. They interfere little with your balance, but they spin your opponent slightly out of punching position. If you watch a professional fighter punch the light bag, you'll note that more than half his bag-work comprises a rhythmic tattoo achieved like this: straight left - backhand left - straight right - backhand right -straight left - etc. You may ask, "Why this backhand striking, when the backhand blow is illegal in boxing?" The answer to that is: He's sharpening his backhand for glance-offs and blocking. If you get a chance to use the light bag, spend half your time on that tattoo. A power-backhand for glancing and blocking is almost as useful for a fighter as is a good backhand for a tennis player.
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Jack Dempsey (Toledo arts: championship fighting and agressive defence (Martial arts))