I know a lot has been written on the forums about cardio, but I still have a few questions left. I know that it is recommended to either run for about 20-40 minutes or engage in some sort of aerobic activity twice a week.
My knowledge of exercise physiology is rather limited so I still don't understand why you need to do any cardio at all if you follow foundations? Doing a foundation workout does seem to raise your heart rate and it lasts for 20-30 minutes. Perhaps foundation workout is more akin to interval training (anaerobic)=short bursts of intense activity that can't be sustained for long and so to meet the cardio(aerobic) requirement you need to do something less intense for a longer period of time? I suppose pure strength training (low reps and near maximum effort )is anaerobic in nature. But most excercises in foundation one follow a high rep and medium effort template and that seems more similar to aerobic activities rather than anaerobic activities.