In warmer climes, shorts may be all the rage, but in the U.K, jogging bottoms are important. They keep your legs from stiffening up so you can get the maximum benefit from jogging. Jogging bottoms have to perform a real balancing act, keeping you from getting too hot or too cold no matter your level of exertion.
Everyone should exercise and jogging is a great exercise in so many ways. Keep your heart and legs strong.