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Move constantly to keep the larger opponent from grabbing you or landing strikes. Stay light and poised on the balls of your feet so that you can change directions quickly and keep him guessing. Since his reach is longer than yours, stay safely outside of it until you’re ready to move in and counter with a strike or takedown of your own.  One method you could employ is to “dance,” or move in a circular motion around your opponent while staying outside of his striking range. When you sense a punch coming, duck, dodge make sure you’re too far away for it to connect.  Since the legs are longer than the arms, becoming proficient at kicking can help overcome your opponent's reach advantage. Whatever you do, don’t let a larger opponent get their hands on you. One wrong move could end the fight in their favor. When your opponent is least prepared, close the distance between you and move in close. This will neutralize his superior size and reach and put him in the right range to land some hard shots of your own. Finding the right timing and approach for getting in close is paramount for emerging victorious—you cannot win a fight with a bigger attacker by playing into his strengths.  When negotiating range with a bigger opponent, the most important thing to remember is to stay out of the “danger zone.” This is the range at which he can hit you but you can’t hit him back due to his added reach. Move in suddenly after dodging a blow or feinting one of your own, or follow your opponent’s punching arm back as he retracts it. One of the downsides of being taller and heavier is  that it takes more effort to move, and as a result you run out of energy faster. Use this to your advantage. Keep slipping, dodging and moving constantly until your opponent begins to slow down. At that point, you can use your speed to slip into close range and unleash some punishing offense of your own.  Working out to improve your cardiovascular conditioning can prepare you in the event that you need to be able to outlast an opponent’s onslaught during a fight. The strategy of allowing an adversary to tire themselves out before finishing them off has become known as the “rope-a-dope” principle. Muhammad Ali used this gameplan to win a championship bout with the larger George Foreman at the Rumble in the Jungle in 1974.
Use evasive tactics. Get in close. Tire them out.