Go pick a fight on strong looking dude and get bashed up..

Thats what my dad told me to do when I was depressed.

Try something new and diffrent I suppose. Try break out of ordinary things and do something wierd (Try Shouting Haka, Dancing Butou, Spining and jumping around your back yard.Make sure you put your full effort in though)

If none of that works.. Watch a FMP fummofu (anime)