2. Mindfulness or ("mindfulness cognitive behavioral therapy" if you prefer the Western term).
3. Doing an activity that creates "flow" (painting, sports, writing, whatever)
(and this one by O'Dog) 4. Doing and activity that requires intense constant focus (and maybe even an element of risk) such as juggling, riding a bike, rock climbing, riding a motorcycle...
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh