Public Speaking - Challenge yourself over breakfast
Every day, choose an article from the newspaper (or the news if you aren't a morning reader) and compose a swift presentation either arguing for or against it.
Be disciplined; your presentation has to have a clear beginning, middle and end. It needs to be concise and you need to incoporate at least one piece of evidence to support your case.
Push yourself; if you have a possible audience, get them to join in. This could be a perfect activity for the school run and both you and your children could be developing skills at the same time.
The more you practice... the more fluent you will become. Five minutes every day and you will not only develop potential conversation skills but will also be on your way to becoming a skilled presenter on any topic.