Steve Jobs is known for his legendary keynotes

Steve Job's keynote introducing the iphone is legendary. Watching it, you would think 'this guy is a natural.' And boy would you be wrong. When Job's had a keynote coming up, he would start preparing TWO MONTHS before. Two months! At the 1 month mark, Jobs would clear his entire calendar and spend all day, every day practicing on site at the location that keynote would be delivered. 

He would deliver his speech hundreds of times, often asking for feedback from whoever was around. And he was meticulous about every single aspect - the lighting, the order of the slides, when he should pause, what body movements to use at what point etc. He had every word memorized, every pause, every step, every arm raise down to perfection.   

And it paid off. His 2007 keynote introducing the iphone is known as being one of the best keynotes ever.  

And yet, all of his skill came from practicing. Imagine how good of a speaker you could be with practice.!