Action cameras for extreme sports have good image stabilization. This makes your videos look smooth and reduces vibrations as much as possible. You can use these action cameras during mountain biking or snowboarding, for example. The waterproof action cameras are suitable for water sports such as surfing and kite surfing. These models are usually waterproof to a depth of 10m. These action cameras aren't suitable for diving. For this, you need a waterproof case which makes your action cam waterproof up to 60m, for example.