Finding Your Comfort Zone
Most people will tell me that they can focus more on their posture, voice, and eye contact when they know their message well. I absolutely agree. However, it is unrealistic to expect to be well-prepared for all of your interactions.
I'd like to turn that thinking around. Imagine if you were so habitual about good posture, strong voice and optimal eye contact that the ONLY thing you had to think about was your message. That's the comfort zone.
Your message may change in every conversation. However, if you put in the practice time, your optimal speaking skills will become habits your can rely upon in every interaction.