Swimming is a great workout for the whole body, but it can be tough on your legs.A kickboard is great for giving your legs a break while still getting a great cardio workout. using one helps to build up leg strength and endurance; it can also be used for a variety of different leg exercises.But that's not all! These boards are also great for helping you maintain good form while swimming. They can help you stay balanced and keep your head above water, which is essential for swimming correctly.