Tennis balls are no longer exclusive to tennis players. They may belong to the court, but they also have other interesting benefits regarding in-flight discomfort. Flying long distances can be tiring and frustrating. Jetlag is not something to look forward to. When traveling in economy class, you are bound to suffer from sore muscles due to a lack of enough real estate to move around. The good this is that there is an inexpensive way to deal with such a situation. A tennis ball! It is the secret behind relieving stress and strain in your muscles during your flight. Let’s look at the reasons why a tennis ball should be among the top things to carry in hand luggage.