In reply to Kemics:
I am probably much older than you, so I don't know if this will be of any help, but about 10 years ago a friend (a PE teacher and keen hockey player) recommended glucosamine tablets. I was an active (but not very succesful) hill runner and years of that and carrying big rucsacs on the hill when climbing meant that I began to get a really sore left knee during and after running. She swore by the tablets, and I have been taking them since and have had no more problems. This being UKclimbing, someone will no doubt severely lambast me for suggesting them, but they have worked for me. They did take about 8 weeks to be effective, but hey ho, they may be worth a try.
> I have fairly decent cardio from biking, I ran a half marathon without any training and was fine, except by mile 10 I had quite achy knees.
> Do knees condition up and respond to training load, or are they more just genetic luck of the draw?
> I'm planning on running a marathon in October but I would like to build my mileage up slowly so I can push for a good time rather than just hobbling round. If I build up my mileage slowly will this protect my joints...also does anyone include any stretches to help or supplements?
> Muscles and cardio I have no problems