This is the key from the post above:
Ever notice how the "fat burning" mode of the cardio machine seems so easy? It's because you need to keep your heart rate low to use fat as a fuel source.
It's not that 30 minutes is too much - it's what that 30 minutes entails. Actually - you should vary your routine from what I understand - 30 minutes one day, then 45 the next, then 20 and so on. Your body gets used to 30 minutes as a routine and you don't want that. Or is that a myth too?
Quote:
Originally Posted by spanishdoll
I'm curious as to how 30 minutes of cardio is too much? I know that if you do too much it will burn muscle, but I was under the impression that we were talking more like 1 hour of cardio. 30 minutes seems like a normal session to me.
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