An informational speech/lecture I have heard in the past was on: "How to Stretch to Get Your Splits" Personally, I felt that this speech was merely somewhat effective.
The speaker did well on incorporating presentation aides into the speech, for she demonstrated the stretches herself.
The speaker could have improved on the presentation of the material itself, for she read directly from the slides.
This action hindered the effectiveness of her speech, for it caused the audience to meddle in a state of boredom.
Thus, This could be the answer.
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