For example, the cardio workouts for monday's and tuesday's are both examples of HIIT Cardio workouts.
When I do the hill sprints, I get on a treadmill and I raise the incline to 10.5 and I put the speed up to 8.8. I then sprint for a period of 20 seconds then I will jump off and rest for 20 seconds and I keep repeating this for 10 minutes. This is probably one of the highest intensity workouts you could ever do but remember it is only 10 minutes.
When I do the jump rope routine I will jump rope for 2 minutes straight, then I will rest for a minute. I will continue this until I have completed 10 sets of 2 minutes.
The reason HIIT is so good for fat loss is because it creates spikes in your heart rate which, in a sense, shocks the body making it release fat from all over your body utilizing it for energy. In layman's terms it makes your body say OH SHIT I AM ABOUT TO FALL OFF A TREADMILL!!!!! GIVE ME SOME FAT FOR FUEL SO I CAN KEEP UP WITH THIS DUDE!!
These are perfect examples of High Intensity "Interval" workouts. The 2 mile run and treading water are simply High Intensity Workouts. NOW in the world of fitness jargon, a high intensity workout is characterized as any workout where your heart rate is above 65% of your maximum heart rate for over 10 minutes.
A good way to figure your maximum heart rate is to take 220 and subtract your age. I am 22 so my max heart rate is 198. So theoretically if my heart rate goes to 199 it will explode, but clearly this is not what we want. I have figured out that in order for me to do any kind of High Intensity Workout-a workout that forces your body to utilize fat for energy, I need to keep my heart rate above 148 for a little over 10 minutes.
So remember, if your heart rate is above 65% of your maximum heart rate, there is a really good chance you are burning fat for energy and saving muscle.
Do a workout like this after about 20-25 minutes of lifting free weights and your metabolism will soar. Do this 3-5 times a week, coupled with a diet filled with fibrous carbohydrates, lean meats, fruits, and vegetables and BAM!!!! You are losing fat and you are looking and feeling straight SEXY!!\
Enjoy
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