Hi! I have been reading a lot about HIIT training. High intensity interval training. A brief 15 min workout consisting of intervals will increase growth hormone levels, testosterone levels, and fat burning processes will start. And all of this without increasing catabolic levels, cortisol, like longer cardio workout (20 min+) will do! In a study people who did this kind of interval training dropped their bodyfat 5% without altering their food intake. I want to build more muscles with HST, and lose fat with HIIT. Because of all the benefits of HIIT, testosterone, growth hormone etc. I think HIIT can actually aid in building muscles. The best example I can possibly think of right now is to look at the sprinters in the olympics like Maurice Greene and all of those buff guys, and compare them to the long distance runners. I read in a study that it is the hormone benefits of interval training that makes sprinters able to combine well developed muscle mass with low bodyfat. I am planning on doing HIIT two-three times per week. 15 min. As long as I keep up my food intake and protein intake, I think this may work!