Unless you're stepping on stage or getting ready for a photo shoot in a few weeks, then one of the key factors in determining your cardio type should be what you enjoy doing.
Before we dive into the science, keep in mind the “best” type of cardio is the type you'll actually do. This is a motto I apply to my training and even nutrition for that matter. It's often better to stick to what's “enjoyable” rather than what's “ideal” for long-term results.
Your Two Cardio Options
There are essentially two types of cardio: high-intensity and steady-
state. Before we go any further, let's make sure we're on the same page as to how we define each of these two.
Often, when I mention high-intensity cardio to someone, they immediately say, “Yeah, the cardio I do is high-intensity.”
Then I ask them how long their intervals are and they either look at me like I'm from another planet, or they think they miss understood what I'm asking and say “I go for 30 minutes.”
Wrong answer, Private, wrong answer.
High-intensity, at least as for purposes of this article, is defined as something so intense that you couldn't keep it up for more than 60 seconds — no matter how badly you wanted to! So even though your incline treadmill walk may feel like “high-intensity cardio,” it ain't.
Running at 10 mph on a 10 degree incline for 10 seconds; now that is high-intensity!
Now that we're on the same page as to the definition, you can clearly see that to do high-intensity cardio, you'd have to do it in spurts — do some, rest, then do some more, and so on. That's exactly what we call high-intensity interval training, or HIIT (pronounced “hit”) and the best way to burn fat fast with cardio.
When most people think of cardio, they think of steady-state cardio. For that reason, I often simply refer to it as regular cardio. Since high-intensity cardio has it own, cool acronym, let's refer to steady-state cardio as “SSC.”
Steady-state cardio is any cardio that's done at an intensity low enough such that it can be maintained for a longer period of time. While you may warm-up and cool-down, any cardio session where you keep roughly the same pace throughout your session is steady-state.
That's right, even if you're sweatin' like a whore in church, it's still not high-intensity if you can do if for more than a few minutes and the best way to burn fat.
What you probably don't know, is that while you are slowly burning “some” calories , others are stripping twice as much fat off their bodies and in half the time!
FACT
You can burn fat 2x FASTER and in HALF the time by incorporating High Intensity Training (HIT) into your exercise routine.
THE SCIENCE
When it comes to weight loss, it doesn't matter what type of fuel (food) you use. What matters is how many calories you burn as opposed to how many calories you take in.
As already stated; In order to lose fat, you must have a negative energy expenditure. Simple!
Energy out > Energy in
The Basics of Burning Fat 
Our energy comes from fat , carbs and protein. But which one our bodies utilizes depends on the kind of activity we are preforming.
Now, most people want to use fat for energy. Sounds legitimate as we assume, the more fat we can use as fuel, the less fat we'll have in our bodies. But, using more fat doesn't automatically lead to losing more fat.
Understanding the best way to burn fat starts with some basic facts on HOW your body gets its energy:
When it comes to the best way to burn fat, it doesn't matter what type of fuel you use. What matters is how many calories you burn as opposed to how many calories you take in.
That said…..you burn WAY more calories during High Intensity Training than your standard aerobic exercise.
Think about it this way: When you sit or sleep, you're in your prime fat-burning mode. But, you've probably never contemplated the idea of sleeping more to lose weight, as lovely as that thought is.
The bottom line: Just because you're using more fat as energy doesn't mean you're burning more calories.
THE SKINNY
The more intense the workout, and the more muscles utilized, the more oxygen is consumed as muscles use energy when they contract. The more oxygen is consumed, the more energy is expended; the more calories you burn!
Flavia Del Monte
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R.N., C.P.T., PN Certified (Sports and Exercise Nutrition)
Author of the new Full Body Licious body shaping program for females who want to look slim toned and sexy.
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You can follow my progress throughout my recent 12 week muscle building transformation challenge. In just 12 weeks and using limited equipment i was able to burn 28lbs of body fat and gain 9lbs of new muscle.

The picture on the left shows one of my before photos which was taken on 1st April.
Weight: 201.6lbs
Body Fat %: 23.86%
Fat Mass: 47.95lbs
Lean Body Mass: 152.05lbs
Waist: 38inches

The picture on the right shows one of my after photos which was taken on the 1st July.
Weight: 180.6lbs
Body Fat %: 10.59%
Fat Mass: 19.13lbs
Lean Body Mass: 161.47lbs
Waist: 33.5inches
You can read my full muscle building transformation story here.
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