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Your mood and thought processes can affect your hormones and other parts of your body. Think of something scary, and you can make your pulse race and your palms sweat.
But if you get chased by a tiger, your pulse is going to race far more, and your whole body will sweat.
There's no amount of thinking you're being chased that equals the effect of actually being chased.
Additionally, working out causes muscle micro tears (from what I understand), which is part of the mechanism for building muscle. Like you said, no amount of imagination will produce the physical effects of exercise.
Tell that to my dreams :-/