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		XCO-TRAINER® The XCO-TRAINER® is an anodized, weather-resistant aluminum tube containing a highly specialized granular substance, which serves as an oscillating mass. The determining factor is not the weight of the training tool, but rather the amount of force applied by the individual user (or trainee).		XCO-EFFECT Originally developed as a physical therapy aid, the patented secret lies within the XCO-TRAINER®. Unlike stationary dumbbells, specially patented granules inside the XCO-TRAINER® serve as a dynamic mass which increases in direct proportion to the momentum of your own swing.		When activated by rhythmic swinging motions, the oscillating mass of the XCO-TRAINER® dynamically harnesses the power of the user’s own momentum and unleashes a powerful counterbalance to the exercise it is being applied to, thereby greatly increasing the effectiveness of the activity.