does cardio eat muscle
Your body will only burn muscle if you are not consuming a sufficient amount of calories. So the idea that cardio âburnsâ muscle is based on the amount of calories you are consuming, and if you donât consume enough calories, your body will start to eat your muscles for energy. In the fitness world, cardio performed at medium to high intensity for OVER an hour is seen as the marker for your body to enter the muscle burning state. 2  Try to keep your cardio within the hour and it will be very safe that your body will not lose your lean muscle mass.