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.
It is called WORK-ing out for a reason.
I said getting fit was simple, I did not say it was easy.
Cardio burns calories, strength work burns fat.
Eat well to lose weight, exercise to get fit
You can not build a six pack using twelve packs
Often when we seek a magic bullet for fitness we end up shooting ourselves in the foot.
"I think calories are little germs in food that all moms are afraid of" Dennis the Menace