I'm 22, currently 169lbs, 6 feet tall. I've been weight training for a year and ten monthes. I have made significant gains in muscle mass in this peroid, hence, I have a new goal. I'm trying to lower my body fat % as low as possible so I look like I'm chisled out of wood. I have until the end of may to do this. Starting a couple weeks ago, I started doing cardio workouts for the first time in over a year. I have also been doing my normal weight training routeins. For my cardio I have been jogging a a treadmill, but I have been using a slightly different approach. I've been running at a slow jog (about 50% of my max speed), which happens to be 5 mph. Every minute I add an incline to the mix to make my heart rate jump around, which kind of resembles HIIT training. For example. I'll run at 0% incline for 30 seconds. Then I'll run at 3% incline for 30 seconds, then I'll go back down to 0% incline for 30 seconds, than I'll go to 5% incline for 30 seconds, then I'll go at 0% incline for 30 seconds, than I'll go up to 7% incline for 30 seconds. Then I start the while process over. When I first started doing this I was doing it for 21 minutes, and I've been adding 3 minutes every week, and now I am up to 30 minutes. I plan on working my way up to 45 minutes. I'm wondering if this workout will burn fat or just increase endurance. My diet is good. I eat tons of protein and I try to keep my carbs as low as possible. I also take a multi vitamin, and when I can afford it, protein supplements. Since I started doing this workout, I have went from 171lbs to 169. I don't know if it's water, or if I'm losing fat, or muscle, or what, but I have seen no change that I can notice. Any comments, suggestions welcome