You know that you should do more than just speak. You should break up your talk with a little variety, whether it is simply a story that helps make your point or an activity that will make sure participants remember your ideas. There are lots of places to find these types of items. There are even books full of these activities especially for trainers. As you might guess, I draw mine mainly from the world of magic. Here's a magic-related betcha that you can use.
To work this effectively you will need a piece of rope between three and four feet long. Any length in that range will do. Ask someone to volunteer to help you. The best way to do this is to decide who you will ask earlier in your program. At the correct time look right at them and ask them to step up to you. While they are joining you drape the rope over one of your shoulders, where it can be easily retreived. You will alternate between actions and explanation for a few steps. Ask you helper to hold out their hands. Indicate the desired position by holding your own out about shoulder height, palms up. When they comply place one end of the rope in each palm. Now ask them to close their hands into fists and let the rope hang in front of them. Once the volunteer reaches this position you explain the challenge they face. They are not to open their fists for the rest of their time holding the rope. But they are required to complete the challenge by tying a knot in the rope. Stand back and let them try. Some will wind up and start twisting away. Some will hold still and look away while thinking up ways to make it work. Let them get coaching from the group. Give them enough time to be sure they have really tried, but don't let others get bored. Then show this solution.
Have your volunteer hold the rope out for you in the starting position. Before you take it, cross your arms. Turn to allow the entire group to watch your fists, then uncross your arms. As the rope drops away it will form a knot. Take your bow. This is a good way to make a point that the right knowledge can enable someone to achieve results that they couldn't enjoy any other way. If you would like more involvement you could bring ropes for the entire group and let them try the exercise together.
This is just an example, but I hope it encourages you to look for ways to break up your talks and illustrate them in memorable ways. Have fun!