"Public speaking muscles" refer to the physical systems—respiratory (diaphragm, abs), vocal (larynx, vocal cords), and articulatory (tongue, lips, jaw, face)—that create speech, plus core engagement for posture and overall body control; like any muscle group, they need training (practice, warm-ups like yawning, facial stretches) to build strength, stamina, and coordination for clear, powerful delivery, turning speech from a mental effort into an automatic, confident skill through muscle memory. 
 
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