My clients come to me for a variety of reasons. Some are content experts who do a lot of speaking, but are always seeking to improve. Others are running for office and engaging in high stakes, very public communication from dawn till well after dusk. Still others want to get ahead professionally, and know they need to step up their speaking in all situations - around the conference table, with clients, at networking events, etc. They come to me for different reasons, but they express many of the same concerns.
One I hear most often is, "I want to be able to think on my feet" or "I need to learn how to speak off the cuff." Clients are a bit dismayed when I tell them I have no magic wand to immediately make them extemporaneous geniuses. I do have strategies that I share, which vary according to client and situation. But one general rule I tell everyone - slow down! The benefit of this is two-fold: it gives you time to think about what you are saying before you say it (which, we can all agree, is a prerequisite for sounding intelligent), and it helps you avoid those filler words which at best are a minor annoyance to the listener, and at worst make you seem disorganized and unfocussed.
Try slowing down today; what have you got to lose? Just a few "um"s, " you know"s, and (cringe) "like"s that you and your listener will not miss at all!