Which of the following muscles is not strengthened to any substantial degree by abdominal curl-ups without rotation to the right and left?

Name: Which of the following muscles is not strengthened to any substantial degree by abdominal curl-ups without rotation to the right and left?
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Question

Quizplus · Accepted Answer

Abdominal curl-ups primarily target the rectus abdominis and, to a lesser extent, the internal and external obliques. The erector spinae, which is located in the back, is not significantly strengthened by this exercise.

Which of the Following Muscles Is Not Strengthened to Any