I always love using my phrase for this explanation.
“Push heavy rock, soft meat happy”
The joke aside, it is similar to a short term antidepressant. Doing something makes your brain happy since you achieved a success. Doing something that tires your body also forces your brain to focus on the muscle ache and all the other signals your body is giving out.
Partially pressing the mute button on the other bad signals your brain gives.
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