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My friend is a hematologist, and we were catching up recently. We were on the topic of our workout regimes and he was telling me that there is no comprehensive study that can explain why muscles grow when working out. Is this accurate?

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My friend is a hematologist, and we were catching up recently. We were on the topic of our workout regimes and he was telling me that there is no comprehensive study that can explain why muscles grow when working out. Is this accurate?	1
How will the universe look/be trillions of years from now?	0