True, but self-discipline means to do something you know you should do but don't want to do and do it anyway.
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The answer is: "social epidemiology" .
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" <u> Social epidemiology </u> i<span>s the study of the causes and distribution of health, disease, and impairment throughout a population."
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I’m sorry but I don’t understand your question. Please post a photo.
The answer is isometric contraction. Isometric contractions generate force without changing the length of the muscle.
Hope this helps! :)