As any 100 metre sprinter knows it’s much harder to win if you get off to a slow start.
Likewise the first 30 seconds of your presentation can determine the rest of your talk.
At a recent workshop we saw this first hand as one of the delegates would listen for the first 10-15 seconds to other delegates speaking then switch to his mobile if he didn’t hear anything that interested him.
This isn’t new – watch any conference group. They want to listen but need an incentive.
The first 30 seconds is your time to grab the audience’s attention – tell them your purpose, the benefit to them listening and make them like you.
You must rehearse this 30 seconds the most.