I agree that aerobic training is very beneficial. When I ran competively around 4-5 years ago I never believed it I mean how can running slow make you fast right? I just kept up running at anaerobic threshold and never really getting much faster in the distances over 5km. So any way I was bored of running by then so started just plodding at 9 to 10 minute pce miles for an hour around 4 days a week thinking I was just maintaining my fitness. 4 months later I entered a 10 mile fun run for the hell of it and nailed it in 60 mins where as before that would take me 90 mins blowing a gasket. I couldn't believe it. Try it.