The video shows a swimmer in a pool, moving through the water with a butterfly stroke. The swimmer is wearing a swim cap and goggles. The pool has lane dividers and the water is clear. The swimmer's movements are smooth and coordinated, with their arms and legs moving in a synchronized manner. The swimmer's body is partially submerged, and bubbles can be seen around them as they move through the water. The lighting in the pool is bright, and the tiles on the pool floor are visible.