I've been cutting ever since spring showed up and I've found my calorie requirements to maintain 187 lbs. at 6'1. At first, the fat was visibly coming off very quickly, which was obvious from my increased vascularity and much more muscle definition. In recent weeks, it seems like my fat loss has slowed down dramatically. I'm doing more intensive HIIT cardio training, but I just can't get my abs to show up or to make my muscles more defined. What should I be doing differently, or should I continue what I'm currently doing? Is it a diet related issue?