I think it's a bit of an exaggeration. There's an interference effect but there's people who compete in natural bodybuilding that run marathons as well.
Absolutely, if you do strength/resistance work that'll counteract the tendency of long cardio to burn muscle.
My point is just that if you /only/ do long cardio, it'll reduce the mass of muscle that you need both to burn calories and remain uninjured. Good to mix it up a bit.
My point is just that if you /only/ do long cardio, it'll reduce the mass of muscle that you need both to burn calories and remain uninjured. Good to mix it up a bit.