Some people think these strange foam things are pillows used for camping. Little kids often use them as building blocks, but swimmers know exactly what they are for. The pull buoy allows the swimmer to focus on training only their arms. A pull buoy or pull float is a shaped piece of  foam used in swimming. Swimmers place the buoy between the legs in the crotch area to provide support to the body without kicking the legs, basically the opposite of a kickboard. Pull Buoys are an excellent training device for developing endurance and upper body strength. Using them gives the arms an intense workout by providing flotational support for hips and legs. One of the best selling swimming pull buoys is the Speedo One Piece Pull Buoy. It is available in both the Speedo Jr Pull Buoy size and the Speedo Large Pull Buoy size. Good body position and technique can be established and the breathing rhythm can be refined. This piece of equipment is a good aid to help swimmers enjoy their training. The pull buoys also provide swimmers with heavy legs a way to be better positioned in the water. There are many different sizes, shapes and colors to choose from. Be sure to pick one that will just give you enough buoyancy to level out your body position. A pull float that is too small will allow your legs to drag in the water, while a pull buoy that is too big will float your legs and push your head and arms down in the water making it very hard to swim.