TRAIN IN VAIN
Your personal trainer is going to lie to you. They're going to tell you the types of lies that make you take that extra step, lift that extra weight, finish that extra rep, or, in the worst-case scenario, not tell you to skip that exercise you haven't mastered before you hurt yourself. Unfortunately, some will also lie in an "I'm taking money from you for worthless nonsense" way, and it's up to you to figure out which is which while paying an average $60 to $75 per session.
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