Having self confidence is one of them. If you are confident and comfortable with yourself then you will project this outwardly.
If you are not self-confident then think of someone who is and copy their voice patterns, body posture and non-verbal signals (NVC) which you think contribute to their self-confidence.
This may mean for example, walking more slowly/ more briskly, lowering the pitch of your voice, or speaking more slowly/ more quickly.
Socially confident people have good emotional intelligence; not only are they self-aware and know how to control their own emotions, but they can sense others’ moods and know how to deal with them. Your spoken word and body language NVC must be telling the same story. If they don’t there will be leakage and people will sense that you are not being genuine. You should mean what you say but you don’t always have to say what you mean.
Physical presence is the quality that makes people give way for you or listen to what you have to say. This is mainly communicated through body language. Having an assertive posture – standing with feet slightly apart, looking still but alert (a zen-like martial arts readiness posture), maintaining eye contact but not overpowering others, smilingappropriately (and eliciting smiles in return), and being confident with your gestures.
Tall people are considered to have more leadership/command presence, so hold yourself tall (that piece of string through the centre of your head to the ceiling) and no slouching. Wear high heels and flattering clothes that make you look taller.
If you are really keen sign up for a Karate, Aikido, Yoga or Tai Chi class to help improve your self-confidence and develop your inner calm.
For those of you who feel less than charismatic the good news is that researchers have now found ways of measuring charisma and also how to teach it.