How did the ichthyosaurs swim?

Ichthyosaurs swam using a combination of their streamlined bodies and powerful, paddle-like limbs. Their elongated, fish-like shape reduced drag, while their forelimbs evolved into flippers that facilitated propulsion and steering in the water. They primarily used a vertical tail, akin to that of modern dolphins, to generate thrust and maintain speed during swimming. This adaptation allowed them to be efficient and agile predators in marine environments.