Not necessary
At a gym, you see all these machines that have charts to show you the fat burning or weight loss zone. The idea is that to burn the most fat, you should work at a fairly low heart rate — not be breathing hard. But that’s a myth. It’s true that when you’re working at a low intensity, your muscles burn more fat. And when you work harder, your muscles switch to burning more sugar. But they burn it faster, so you use up more calories. The bottom line: It’s calories in versus calories out if you want to lose weight
At a gym, you see all these machines that have charts to show you the fat burning or weight loss zone. The idea is that to burn the most fat, you should work at a fairly low heart rate — not be breathing hard. But that’s a myth. It’s true that when you’re working at a low intensity, your muscles burn more fat. And when you work harder, your muscles switch to burning more sugar. But they burn it faster, so you use up more calories. The bottom line: It’s calories in versus calories out if you want to lose weight