The video shows a swimmer in a pool, moving through the water with a butterfly stroke. The swimmer is wearing a black swim cap and goggles. The pool is divided into lanes by yellow and red lane dividers. The water is a clear blue color, and the swimmer's movements create splashes and ripples on the surface. The swimmer's arms move in a circular motion, and their legs kick in a dolphin-like motion. The swimmer's body is mostly submerged, with only the top of their head and shoulders visible above the water.