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In this Portuguese monologue, the speaker discusses an unnamed shoulder exercise he observed someone performing, which targets the posterior deltoid through arm extension. He confirms the movement is valid and effective for the posterior deltoid, but warns that it carries a risk of spinal rounding as the load increases. He notes that beginners may feel the exercise works well because the muscle is unfamiliar with the stimulus. The speaker recommends safer, more controlled alternatives such as the reverse fly on a machine or posterior deltoid work on a cable. He personally dislikes the original exercise, emphasizing that while it can work, better options exist.
