Hi Cathe, I recently added your Maximum Intensity Cardio and Interval Max tapes to my workout routine. I've been working out for a long time so I wasn't anticipating any problems using these advanced tapes. But I notice the arches of my feet are very sore afterwards. Am I doing something wrong or is there something extra I should do during the warm up to prevent this? Thanks for your help. I've been doing your strength training tapes for quite awhile and really enjoy all of them. Sheila