If you want to take out some aggression in the boxing ring without having to actually take a hit then the Takara Tomy BattroBorg 20 battling robots will be right up your alley.
The boxing bots are controlled by the Wii-like nunchaku joysticks and offer all of the rock 'em sock 'em fighting that you and your droid can handle. The fight comes as close to you being in the ring yourself as possible as your body controls the movement of your robot. When you throw a mean left hook, for example, your droid mimics your movement.
Be sure to keep your bots pre-programmed movements in mind however, as only the left arm can hook while the right arm delivers a straight jab -- so throw your punches accordingly.