A pull buoy is a swimming training aid designed to help swimmers improve their upper body strength and technique. It is typically made of foam and is placed between the legs to keep them afloat while the swimmer focuses on their arm strokes. This allows swimmers to isolate their upper body movements without the distraction of kicking. Pull buoys are commonly used in swimming practices and triathlon training. They come in various sizes and shapes, catering to different skill levels and preferences. By using a pull buoy, swimmers can enhance their stroke efficiency and build endurance in their arms and shoulders.