Quick public speaking tip – Use variety to keep attention

You can avoid boring your audience by varying the pitch and the volume and pace of your words. Use pause for drama.
Speak quickly to communicate your energy and enthusiasm, and then use a slower rate for emphasis.
You can also deliberately vary the structure of your sentences. A single word can have huge impact used on its own, particularly if it comes after a wordier segment.
All of these are keeping your audience hooked.