Because when you’re working out you’re thinking about how horrible it is and how badly you just wanna go home you don’t have time to think about anything else! Lol but in all seriousness it’s the endorphins that kick up in your brain. Walking, running, doing yoga, having sex. Your brain takes it the same way as doing drugs and it creates this calming effect.
I’ve always found that it makes my depression worse. Too much time in my own head to start thinking about how bad I am at whatever I’m doing. Boxing was the only thing that I semi-enjoyed because I had to constantly be thinking ahead to land punches correctly.
But things like treadmills, running, exercise machines were hell.
Our brain evolved to respond to stressing factors in a specific way. Our stresses were mainly being hunted or needing to hunt after prey. Being chased/chasing something-> need to pump blood easier, so it eases blood circulation, heart beating faster, it stops digestion so you can focus on the priority of survival, etc. Once you stop and have a chance to rest, your body goes on the reverse to feel better, recover and regain the energy you spent.
That’s how our bodies are engineered to respond to a threat, to stress. Now try to ease your stress when it’s about your existential crisis, your financial state, your academic grades, your relationships. They are abstract factors that generate stress. The only way your body is engineered to respond to stress is by physical activity, and by reminding your body that it’s not under imminent physical threat(psychological tools such as grounding exercises).
At least that’s the main thing I remember from a psychology initiation class on the subject of stress and exercise.
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