Rener and Ryron Gracie are living proof that jiu jitsu makes you happier. Whatever their secret is, you definitely want it. I think it has something to do with the Gracie Diet [note: they just published a book on the subject], which makes a lot of sense. Unfortunately for me, it prohibits beer drinking and Clif Bars. So, I choose to live a little less happy.
Check out this duo's enthusiastic breakdown of the those 2 amazing UFC 124 submissions from Miller-Oliveira and Bocek-Hazelett: