Because if it didn’t hurt it could dangerous for us. Our body have a limit on what it’s able to do and the pain tell us when we are getting closer to that limit.
If we couldn’t feel the pain we could for example : Try to lift something too heavy, which could injure our muscle or we could run for too long until our muscle fatigue too much and we collapse.
The way we know we are getting closer to our limit is by the pain, and we can then decide if the pain is worth it or not.
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