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Quick Takeaways: The "Fake" Limit: When you decide that your muscles are completely done, you most likely have a physical safety buffer of around 20–30% left in the tank. Brain vs. Muscle: Your brain is hardwired to keep you safe and comfortable, so it tells you to stop long before your muscles experience true physical failure. Quality Over Quantity: Doing 4 relatively easy sets of an exercise yields far fewer results than doing 2 focused, challenging sets where the last few