The research on the benefits of high intensity short duration exercise has been proven time and time again. Recently I posted the most current research on the topic. www.ncbi.nlm.nih.gov/pubmed/22994393
Anyone can fit in time for short duration high intensity exercise with the options as to what you use almost limitless. Endurance athletes gain benefit from this form of workout which has again been proven by research. I can think of no instance in which it is not a beneficial training method.