The X1-PRO is an aquatic resistance training system that offers several advances in competitive swim training. A compact anodized shuttle mechanism creates bi-directional resistance ranging from free movement to immobility. Resistance levels can be adjusted by the turn of a dial, located on one end of the device. Athletes connect the line to each end of the pool via the existing lane line hooks, clip on the swim belt, and start training. It can be set up in any pool quickly and easily. The X1-PRO is compact enough to fit inside a backpack, is easy to use, and offers real-time instant stroke correction to deliver maximum training results.