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You are repeatedly damaging your skin which is why it's darker.

• ReptileMan 5y ago
  You are repeatedly damaging your muscles and tendons in the gym which is why they become bigger, stronger and denser. So where does that leave us?
  • seattle_spring 5y ago
    How many times have you heard of someone getting muscle cancer from going to the gym?
  • qmmmur 5y ago
    Are you dumb or just a troll?