Athletes can get the equivalent of a two-hour workout in just 40 minutes, while simultaneously correcting stroke deficiencies to have a significantly more effective training session. Not only will they build tremendous endurance, strength, power, and speed, but also will become more efficient in the water with their strokes. The X1-PRO is a device that provides resistance to a swimmer by attaching the swimmer to a small 1-pound cylinder that trails behind them on a line. Inside the cylinder are tension wedges that can change the resistance to any setting from zero all the way to immovable.

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