Just started doing TKD and being out of shape, the first class totally kicked my a**. As a general fitness background, I'm 5'11'', 195lbs and pretty sedentary. I don't get out of breath just walking or anything like that but it doesn't take anything much more strenuous to get me huffing and puffing. I won't run since I hate it and there's no point in even trying. What I've decided to do is walking on my treadmill(3.5-4mph) along with doing some other types of cardio such as burpees and mountain climbers, which I can only do about 5 of each before I'm out of gas. That's pretty much all I've got figured out at this point. I've read that jumping rope is really good but I've got low ceilings so that's out I think. I can only do my tkd one day a week so I have to supplement it with other physical training the rest of the time. Any other suggestions?