Sport helps, but in my case only cardio stuff, i.e. easy running, cycling, etc. Hard workouts might be stressful too for your body.
Alcohol, smoking, drugs, unhealthy food/lifestyle normally increases stress mid- and long-term
But generally, just try to avoid stressful situations in your live, don't work with clients who are obvious "trouble-makers" (you know what I mean), don't fuck insane girls, and keep a healthy distance between you and "difficult" relatives. That work's best for me
