Swim paddles are training tools used by swimmers to enhance their strength and technique. They are typically made of plastic and come in various shapes and sizes, designed to fit comfortably in the swimmer's hands. By increasing the surface area of the hands, paddles help swimmers develop better pull and improve their overall stroke efficiency. Using swim paddles can also help swimmers focus on their hand positioning and body alignment in the water. However, it's important to use them correctly to avoid strain or injury. Beginners should start with smaller paddles and gradually progress to larger ones as their strength and technique improve.