Generalizations to connect the material. Examples to explain the material. Sprinkle in the new but not simply because it is new. Contrast it with previous practices and show differences, flaws or advantages. Avoid repeating what is already known but consider reminders of points they may have forgotten. [Many of us attend training to be reminded.]
Know what is essential and which items can be jettisoned in the interest of time. Omit jargon. Vary your tone. Give plenty of short breaks. Move along at a good pace.
The ending should leave audience members just a little hungry for more. They should be confident and equipped with practical knowledge that can put to immediate use.
If you are especially excited about a particular portion of the class, consider eliminating it.