a simple diagram of swimmer swimming in the water, showing " drag force" and using it to moves forward. The position is above horizontal line that says " commercial surface". He's floating on his back with one hand outstretched behind him as he flaps for speed. And show other arm down near body moving straight up and away from torso at an angle with movement upward and toward right. Show left side closeup view of male olympic style so手掌 low over shoulder and underwater" swims" not touching the ground or pool bottom. In background there should be words like " crossover", " coarse ", & "brighter lighting --ar 7:6