Currently right now I'm a 2nd green belt in TKD. But the last few months I've been feeling kind of tired when I go to class. Like sometimes my legs will just feel sore when I do kicks and they'll have this lazy kind of feeling that makes me feel like I'm dragging my feet, like my body doesn't want to do what I want it to do. I don't go too often- about 3-4 times a week. I do a little weight training at home- nothing too much. I get as much sleep as I can, and I don't have the worst diet. What could it be? Anyone else have this problem? A lot of times I just have to trudge through a class...