Is it a goofd practice to sit with your legs crossed?

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I always have the habit of sitting with my legs crossed. But I was told by many people (My friends and family member) not to sit so. Since this was a habit of mine for past 15 years, I find it difficult to change. More over, I tried to do some googling on this topic and got various answers for this. Some say, it shows lack of confidence Some say, it as not a good manerism, Some say, it as being very professional. I'm confused. Could you throw some light on this?