The video shows a swimmer in a pool, performing a butterfly stroke. The swimmer is moving back and forth in the pool, with their arms moving in a circular motion and their legs kicking in a dolphin-like motion. The swimmer is wearing a swim cap and goggles. The pool is surrounded by a crowd of spectators, who are watching the swimmer intently. The pool is marked with lane lines and there are advertisements on the walls of the pool. The swimmer is moving quickly and appears to be in the middle of a race.