Think about a speech you've heard that convinced you the speaker cared deeply about the subject. This could even be a sales pitch that gave you the impression the sales person believed in their product. What was it about the talk that drew you in? At least part of it was probably the delivery, the variation of the pitch of the voice, the quick rate at which some of the words were spoken, and the accompanying gestures. Even a sober, serious, speech can convey passion or excitement when there is energy behind it.
I once came across this sentence in an acting book: "Energy is the direct result of how much you care about what is going on in the scene." We can adapt this guideline for our speaking. Energy is the direct result of how much you care about your message and listeners. If you have energy you will have a much easier time with your delivery, gestures will come naturally, your voice will rise and fall at appropriate times (but still PRACTICE!). The energy will do a lot to overcome any stage fright you experience.
The next time you are going to speak ask yourself how much you care about the topic. Perhaps you don't have a choice of topics, but you will have a choice of emphasis. You must report the status of your group's project, but you can focus on the potential, or the ground gained so far. You have a chance to make your team look like winners to the board. Lots of reasons to care about your presentation. Lots of reasons for dynamic delivery.