Releasing stress on punching bag is not good. In psychology factor you're actually replacing the bag as a weaker enemy to release your stress/anger.. When it becomes a behavior, it would be very bad.. But I can't remember bout the theory.. =.=

I release my stress by hanging out with friends, spend on luxury foods and items.. Or go gym and exercise if I feel I wanted to..

You should try.. Eating luxury foods is superb relaxing.. Of course you need a good ambiance, and nice foods. But one person eat at least RM80+, but I feel relaxing and fun tho, especially with friends.
I can't stay in front of the computer so long.. I'll feel more stress instead.. 

Try swensen or haagen-daz.. Order the big set one, for swensen earthquake, haagen-daz fondue. Tutti Fruiti sucks a big time.. Too sweet+expensive.. NO quality -.- Even New Zealand or Gelato much better..
Or you can sit at Starbucks, bring a book and sit there, enjoy the coffee? Look for a place full with lenglui just peek la.. haha