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When at a gym or ever working out in general, keep your mind open to new things. Lots of people think they know what they're talking about, but in general you can always trust those that can name which muscles are being exercised and why during a routine. Beware of pride in the gym, because that generally results in bad posture, too much weight, incorrect form, not isolating proper musculature, and all in all setting yourself up to get hurt. Trust trainers that have training in this, and never pretend like you know everything.