Sharks, as all fish, use their body and tail in a side to side motion to move through the water. Shark fins are rigid not flexible, and are supported by rods made of cartilage. Sharks have five different kinds of fins.

1. Paired pectoral fins lift the shark as it swims.
   
2. Paired pelvic fins stabilize the shark.
   
3. One or two dorsal fins also stabilize the shark. In some species, dorsal fins have spines.
   
4. Not all sharks have an anal fin, but it provides stability for the sharks that do have one.
   
5. The caudal or tail fin moves the shark forward.

To understand more about how sharks swim let's go to the lab and do an experiment!