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Are You Taking a Step Forward?
A study shows that with repeated bouts of effort, we release more and more epinephrine. Epinephrine is kind of adrenaline, but in the brain. Every time you put an effort, you're spending epinephrine; at some point, those levels of epinephrine get high enough that you feel like quitting. So if you're thinking about the effort you're expending, don't confuse what is real.