Originally Posted by El Puma
Define "run a lot"
"Burning muscle" has more to do with an inadequate diet and poor nutritional intake timing when activity levels are high as opposed to running too much.
Not strengthening tendons and ligaments,poor lifting or running form, not giving body adequate time to recover and poor/non-existent warm-up/cool-down make you prone to injuries. Not, lack of muscle.
i disagree with you, because you do have a point about diet etc
it is clear that when you do intense cardio, you burn muscle
i can even notice it myself, after a few days of boxing-cardio workouts
my muscles seem smaller and when i go lifting, i have a harder time lifting
the same weights as i did last week.