There are other HIIT techniques, http://en.m.wikipedia.org/wiki/High-intensity_interval_training http://en.m.wikipedia.org/wiki/High-intensity_interval_train...

There are other HIIT techniques, http://en.m.wikipedia.org/wiki/High-intensity_interval_training http://en.m.wikipedia.org/wiki/High-intensity_interval_train... and I gather a common problem with the model is that you have to squeeze the real intensity out of each session, which can be hard. It's also interesting to read about the genetic test for aerobic fitness progress. I wonder will the future allow better tailoring of health care where genetic evidence helps people get far more precise nutritional and exercise profiles? For example, if you are a non-responder you might be hurt by too much exercise, which is non-productive and which makes you hungry.