Answer:
a social smile
Explanation:
beause smile make people friendly and happy mode so any thinks can do.
It would be appropriate as we increase the time of an exercise to decrease the number of sets of that exercise because duration is more important for effective exercise.
<h3>How to make exercise more effective?</h3>
We should increase the difficulty and duration of an exercise to make it more effective because it produces overload. As an individual exercises at a higher level, the body adapts to the increased demand and this higher level leads to new form of your body.
So we can conclude that it would be appropriate as we increase the time of an exercise to decrease the number of sets of that exercise because duration is more important for effective exercise.
Learn more about exercise here: brainly.com/question/1365564
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