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The best 80 bucks I've ever spent is that which bought a heavy bag to work out my tension on. A ten minute session hitting the heavy bag is a GREAT workout and an incredible stress relief.
I think any kind of physical activity is a great stress reliever. I like to workout and go for runs. While running, my mind wanders away from what may be stressing me and helps me relax. In addition, I get a great workout.