I touched upon High Intensity Interval Training before; now lets go into some details.
My suggestion is to:
Warm up for 2 minutes
Sprint for 30 seconds, and
Walk back the same distance in 90 seconds.
This is one set; do this 8 times and then cool off for 2 minutes. The whole thing takes 18 minutes and unlike other activities like jogging, your body keeps burning more calories for 24 hours.
Another very important result of HIIT is that the body produces Human Growth Hormone that is, in a way, a youth elixir as explained before.
There is a catch, however, don’t eat or drink any carbohydrates for 2 hours after your HIIT session because as soon as your pancreas starts producing insulin, the secretion of the hormone stops immediately.
I don’t eat or drink anything for an hour after I finish my weight training sessions either, for the same reason, even though the production of HGH is probably not as pronounced.
You don’t have to go outdoors and sprint/walk to practice HIIT. Other alternatives are:
The elliptical machine, and the stationary bike in your gym.
I don’t advise treadmills, as increasing and decreasing the speed is not fast enough and could result in falling off and injuring yourself.
I strongly advise that you talk to your doctor before you decide to do HIIT.
When you are doing HIIT your pulse should never exceed your maximum heart rate, 220 minus your age for men, and 226 minus your age for women.
My preference is to do my sprint/walk routine barefooted on grass or sand.
Why barefooted? Although I’ll go into the details of Free Radicals and Antioxidants later on, suffice it to say that when you are barefooted you make use of the Earth’s negative charge and use this as a very potent antioxidant. Didn’t know that did you?
I suggest that you do HIIT once or, at most, twice a week.