There is no benefit to strength from aerobic training, because activities that utilize oxidative metabolism are not dependent on force production, and so do not produce a strength adaptation. Anything you can do for an uninterrupted 2 hours can't be that hard, in terms of the amount of force required. It produces endurance adaptations at the cellular level, changes that are actually detrimental to strength. Long, slow distance destroys muscle mass, beats the hell out of your knees and hips, and takes way too long.
