Making noises
Almost all of us who were fans of the Star Wars franchise had a toy lightsaber that we just loved to play with. We would swing it around all over the house and fight friends for control of the galaxy. As we fought, we usually would make the sound effects with our mouths, which isn’t much different from what the actors did.
It would seem that we were not alone when we practiced without lightsabers in the living room, mimicking the noses it makes. Ewan McGregor who played Obi-Wan Kenobi did that all the time, even during filming. Look closely and his lips are moving during the fight scenes. He must have been a true lover of the series.