I went of mirrors some time back very restritive unless youre fighting a southpaw, even if you are still restrictive against opposite movement and is one dimentionable you are looking at the past as regards motion youve thought of it before doing. Better of with your eyes shut and feel what youre doing it will make the senses which give you speed and motion more responsive to your aims. Two people shadow boxing together even with half a brain will pick up more learning movement and shifts or cons by doing this than looking in a mirror and posing theres to many distractions going on in there head been there done it. The thing is when people play at something theres improvement, call it work it restricfs them, you can be serious even when playing.