The tone of your voice is one of your most important “convincing” tools. We humans are generally skilled at choosing our words, but it is the tone of our voice that gives away our true feelings, and triggers trust or suspicion in the listener. When rehearsing a talk or presentation, record your voice and listen back to how you are coming across. Adding a good dose of warmth, a little more inflection, emphasising a word or phrase and putting in a pause at the right place will impact your delivery markedly, and increase the prospect of your talk having the desired results. And there is no substitute for genuine enthusiasm and a smile!