Moving as much as possible during a flight can help reduce periods of prolonged immobility. For example, getting up to go to the bathroom or walking up and down every two hours can go a long way in keeping the body active. If you cannot get up, perform seated exercises such as ankle circles, leg raises, or foot/calf pumps in order to prevent immobility. Avoid placing hand luggage in places that restrict movement of the legs and wear loose, comfortable clothing.