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I find that a hardcore workout works even better than alcohol. Not only do you get the same winding down effect in a short period of time (assuming you're really killing yourself and working to exhaustion in the gym), but you get a lot of additional benefits along with it: better focus, improved health, boosted confidence, and improved body composition. You wake up the next morning feeling a lot better about yourself…
Using hardcore workouts as a stress coping tool is not much different from having a drink or two. You're not really addressing the source of stress. Working out hard is additional stress. It boosts cortisol just like job stress. Stress depletes magnesium, and so does hard exercise. You will be hurting your health, not helping it, if you're stressed out and then do crossfit type stuff. That you can't train hard and en…
For me I'm really crap at switching off from work, and I can easily torture myself at the thought that I should be working. However when I drink, I pretty much say to myself - that's enough. And likewise if I'm on my bike.
So when I'm not drinking or not exercising, I'm not relaxing, and that's just a recipe for disaster for me - the knock on effect is that my programming really suffers. I find it a very difficult cycle to break away from, despite there being a simple solution.
At least you might be giving your brain time to breathe when you are exercising.