Gesturing as if you were holding a basketball between your hands is an indicator of confidence and control, as if you almost literally have the facts at your fingertips hands. Steve Jobs frequently used this position in his speeches.

When people are nervous, their hands often flit about and fidget. When they’re confident, they are still. One way to accomplish that is to clasp both hands together in a relaxed pyramid. Many business executives employ this gesture, though beware of overuse or pairing it with domineering or arrogant facial expressions. The idea is to show you’re relaxed, not smug.

How people stand is a strong indicator of their mindset. When you stand in this strong and steady position, with your feet about a shoulder width apart, it signals that you feel in control.

This gesture indicates openness and honesty. Oprah makes strong use of this during her speeches. She is a powerful, influential figure, but also appears willing to connect sincerely with the people she is speaking to, be it one person or a crowd of thousands.

The opposite movement can be viewed positively too—as a sign of strength, authority and assertiveness. Barack Obama has often used it to calm a crowd right after moments of rousing oration.

The next time you give a presentation, try to have it recorded, then review the video with the sound off, watching only your body language. How did you stand and gesture? Did you use any of these positions? If not, think about how you might do so the next time you’re in front of an audience, or even just speaking to your boss or a big client. Practice in front of a mirror, then with friends, until they feel natural.