In this short instructional segment, the speaker (Rodrigo Barros) critiques a common chest‑training movement that many athletes perform without properly engaging the rotator cuff (manguito rotador). He explains that the way the exercise is executed turns the load into an isometric effort of the biceps and brachioradialis rather than a true rotator‑cuff stimulus. To make the rotator cuff work, he demonstrates the correct cable‑pull position and stresses that the weight must be placed correctly—matching the “3” on the cable with the “3” on the weight stack—so the load is transmitted through the intended shoulder muscles. The delivery is informal, using colloquial language and a critical tone toward the mistaken practice, while offering concrete corrective advice.
