Answer:
Begin and end your presentation with motivating context
Explanation:
Just as the hourglass is shaped with a large top, narrow middle and a large bottom. Presentations should start on a general and motivational context.
The middle of the presentation should focus on some details and procedures on how to achieve set goals and objectives of the topic. This is where practical steps are given to the audience.
The end of the presentation should again be a motivational context again. The audience is made to see the big picture of the situation.