Disclaimer: yeah I know. This shit isn’t for everybody. I just like to post stuff like this to fuck wit ya…~~~~~~~~~~~~~~~~~~~  Fartlek’s a funny word but no, it doesn’t have a thing to do with your ass –except maybe for burning it off perhaps. What fartlek means is “speed play” in Swedish and it has to do with, well, lemme let the dictionary tell ya:   A mixture of aerobic and nonaerobic exercise: a method of training, especial...