Getting rid of unproductive exercises needs to come before adding in new ones.
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Exercises should not be painful.
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Exercises should look athletic. Although subjective, the exercise shouldn’t make a reasonable person stare out of concern or cringe.
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Exercises should not require you to mentally prepare because you’re questioning your ability to do it or it scares you.
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If your goals revolve around health and longevity (performance can sometimes warrant otherwise), exercises should not involve less than 5 reps.