And exercise...is amazing! Px90 is a great one ( Skittles.. you must be tough ), the endorphins we get from exercise is really pretty feel good stuff. An increase in seratonin, increase in oxygen to the blood and organs including the brain and better circulation of the blood really all help with mood and stress.
If you want something lighter and maybe get some good laughs while doing it try some of Richard Simmons old videos. I picked up a few at a thrift store and omg ya its funny.