Your resting rate will come down over time as will your pressure but the aerobic and anerobic threshold limits should remain fairly constant. I think that your Tae Kwan Do has you in pretty good shape and that is why it is hard for you to get your rate up. As you continue with the Aerobics You will also find that it will take more, and more, exercise to get the rate up. I've been here a few days more than four years. I really love working here, though I had to take a salary cut to be here.
Programs here get very high marks on evaluations from guests.
I have done maybe a half-dozen programs since 1987. If you find yourself out here, look me up. Endless thanks to you and the other lovely souls who make it a wonderful place to share and learn. A good feeling. However, when I get up, and go about the rest of my day, I instinctively pull my abdomen in.