The eloquent, who use language and body language to win the hearts and minds of listeners. These people sound smart, regardless of how intelligent they are. Fortunately, eloquence is a skill that can be taught, practiced, and mastered.
The position of your back is the foundation of your body language. A straight but relaxed spine puts you in a mental and physical state from which words flow smoothly and easily.
They won't listen if you're thinking about something else or if your eyes are wandering all over the room. Avoid glancing sideways — it makes you seem dishonest. If you must check your notes, use your eyes to look downward without nodding your head.
Speak loudly enough so people farthest from you can hear but not so loudly that it's uncomfortable for those in front. But never raise your voice to a yell. If you’re in that position, either ask for a microphone or request that people move closer.
Use your hands to emphasize key points. If you're not actively using a gesture, keep your hands still as fiddling with your glasses, rattling your papers, scratching yourself, and so forth will distract the audience from your message.
If you're summarizing or going over background, speak more quickly than when you're providing new information. When you're describing introducing an important concept, slow down to give listeners time to absorb it.