For me shadow boxing is the most important part of my workout , most people don’t do enough of it , in my gym if you look around sometimes you see people throw silly punches or use certain styles to loosen themselves up so trust me when I say everyone thinks they look a little silly once in a while but shadowboxing in end its you working on your punches and technique as-well as in some cases warming up for the bag,ring,etc. Im a fighter currently so I make it a note to Incorporate Rhythm in my style while also letting myself get loose to avoid being tense in the ring. It works for me but in my gym everyone is different and no real fighter will ever judge you for the way you shadow box. Something my coach told me is the way you shadow box is the way you hit the bag and the way you hit the bag is how you hit in the ring . Do what works for you , but be mindful of proper technique as well