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In this short Portuguese fitness monologue, the speaker introduces the spider curl (rosca spider) by likening its inspiration to Spider‑Man. He explains the biomechanical basis: the exercise involves shoulder flexion that shortens the biceps, creating a distinct loading pattern and advantageous lever/force‑vector characteristics. The speaker warns that a small technical mistake—leaving the arm hanging straight down—causes the biceps to lose tension, making the movement ineffective. He advises positioning the arm slightly forward to keep constant tension throughout the lift. Overall, he praises the exercise as “top” and highly recommended when performed correctly.
