Cathe, I thought I read one time that you had a problem with your Achilles Tendon, my right Achilles is really sore, I'm not sure if it is from doing the Interval Max,which I have been doing for awhile, but I did it three times last week with two days in between, but I'm not sure. I have cut back on the impact cardio, but was wondering if you have any advice. Thanks, Pam