"What does body language have to do with a PowerPoint presentation?" you ask. Well, more than you think. In the same way it's always worth putting some thought into the placement of our text and images or the way we design a slide, it's also worth thinking about the placement of other things "outside of the presentation" like our hands and eyes, as well as the way we present ourselves (no pun intended).
The thing is, you're using body language whether you realise it or not. There's no vacuum here, so you may as well be intentional about it. Being aware of and leveraging the way you come across when presenting can be a great way to add that extra layer of clarity, conviction or persuasion we need to win that pitch, secure that raise or get the team on board for the next project.