This reminds me of the importance of not picking up bad performance habits. Beyond these physical habits, I’m trying to break some bowing habits (e.g., starting everything with a down bow or not using hooked bowing) and some bad fingering habits. (I'm not as worried about the fingering as the bowing as my intonation is good. Maybe I’m even on to another "new method.") In the end, these habits serve as roadblocks in my playing and a need to break them.
I've been able to break other bad performance habits. For example, I used to brathe heavily through my mouth to the tempo of the music. This created a strange "huffing" or "whooping" sound on 1 and 3, 2 and 4, … or every beat. Fortunately I broke the habit. Unfortunately, there are at least four recordings out there where, if you listen carefully, you have definitive proof of this bad habit.