How do you calculate what your heart rate needs to be during a cardio session to maximize fat lose. I typically have been getting on the treadmill and going as hard as I can. Somebody told me that is incorrect and that after a certain level you are defeating the purpose and start to burn muscle as well. I just wanted to know basically what your heart rate needs to be to burn the most fat during cardio. I remember there being a formula for this but cannot remember what it was.
If this post doesn't make any sense let me know and I will try and clarify.