Can be worn two different ways to isolate both the outside and inside muscle groups. Intended for use on drills and stroke-specific training. Paddle provides instant feedback and will fall off if the swimmer does not maintain proper technique. Increases the 'feel for the water' and allows swimmers to make adjustments to improve stroke technique. Using the edge on the outside (grey on left, yellow on right) allows swimmers to isolate and engage the triceps and trapezius muscles. Using the edge on the inside (yellow on left, grey on right) allows swimmers to isolate and engage the pectoral, bicep and deltoid muscles.