past a certain point.
I have been discussing the thing that is limiting me with my running ( lungs/oxygen) with a number of long experienced runners . The general concensus ( in a nutshell) is that , after the amount of running that I have been doing, I have probably reached the limit of my lung capacity - and no amount of running faster, harder or uphills is going to increase it. In other words, my lungs are taking in as much air as they ever will. BUT - what is happening is that because I have only been running for a VERY short time (to them) and the distances that I run ( 5-8K at a time and 18K per week ) are VERY short (to them), my cardiovascular system is not transferring enough oxygen to my muscles via the blood pathways - and the only answer to improve that is to RUN - RUN -RUN and RUN some more - very SLOWLY!!!!! In other words, although there has been obvious improvement in my cardiovascular system, it has been developed largely in the wrong way ( the C25K way) - a short term way rather than a long term solid base way. Hence , I need to run much longer and slowly if I want to run 5K any faster than what I do now. The distances quoted are -- up to 50klms per week before even thinking about doing fast intervals or 5K PB attempts. !!