When frogs float in the water the upper bulge of their back is visible outside the water. When a frog plunges, we can see its feet coming right up away from the water. A frog uses the extension of its hind limbs to swim by kicking water backwards. They kick their feet continuously and a thrust is created which acts as one of the main forces during swimming. The other force is created by the parasite drag during the movement of the feet. Both the forces are required to balance for the frog to swim fast and efficiently. This swimming cycle of a frog altogether can is called the Kick-and-Glide cycle.
