Low intensity exercises are fine if you have issues where you need to perform easily, but what both articles are saying is that the harder and better you work out, the more calories you burn period, which will help your body burn fat throughout the day.
I personally feel that if I don't have an injury or health issue, I go hard.
This is a pretty confusing topic, even for native English speakers.
The body has several different energy systems that it can draw on, depending on how intense the exercise is. But where energy is coming from during your workout is irrelevant for fat loss. What matters is the overall balance between calories burned and calories consumed over the ENTIRE 24 HOUR day.
The significance of exercise is not that it burns a lot of fat in itself, but that it helps swing an overall surplus into an overall deficit, and at some point in the day the body will have to tap its fat stores to make up the difference.
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You've got it a little confused. The first article is saying to exercise hard. The second article is saying that most of your "fat burning" occurs throughout the day outside of exercise. These are not mutually exclusive. Exercise intensely.
DON'T "Exercise in the fat-burning zone." The fat-burning zone is—shockingly—still a very common workout mode on cardio machines. It is programmed to keep you working at a low heart-rate (intensity) level because at low-energy levels your body uses more fat as fuel. That's is true in theory, but in practice it doesn't work out so well. When it comes to weight loss it does not matter where the calories you burn come from, whether glucose in the bloodstream from a recent meal you ate or stored body fat. What really matters is that you burn as many calories as possible regardless of the source of those calories. And what burns more calories? Working harder.
Fat-burning tip: Real fat-burning takes place during low-intensity, daily activities—not during exercise itself. The more calories (glycogen) you burn during exercise and recovery, the more your body will rely on fat stores to fuel the rest of your day. So instead of trying to figure out whether (or what) to eat before you exercise, choose whatever will help you put the most effort and time into your workout session. Everyone is different. Don't eat if it upsets your stomach to exercise soon afterward, but if you feel lightheaded or fatigued when exercising on an empty stomach, then you should eat a pre-workout snack or meal.
So, what would it be? To do or not to do.
Sorry for my English, I'm not a native, I guess we can agree on some tolerance here ;)
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