I graduated from c25k just over a year ago and am still learning a lot about running. most recently I pulled a hamstring on a 10k race, which sent me back to the physio. Apart from the hamstrings needing strengthening (and I've got specific exercises for that) a major issue turned out to be my cadence. I'd not given it much thought before, but it turns out my natural gait is around 150spm and this causes a number of issues which I thought were just age / uselessness related. These include tendonitis, ITB issues, general weakness & sore knees. So I've upped my step rate to 170spm and although i'm a bit slower now (but getting quicker) all those pain issues are going away.
It's all about how my foot strikes the ground and the angle o the knee joint when it does so. at 150spm my stride is too long, my knee joint is quite straight when my foot strikes the ground and I tend to strike with my heel. All bad. At 170spm my stride length is shorter and I'm striking mid sole with a flexed knee joint. Much better!
It took a little getting used to the new step rate, but I used spotify mixes at 170bpm which helped, but then also someone pointed out my garmin watch can be set to show cadence whilst running, which is even easier.
I'm still keeping to tempo runs whilst I make sure the hamstring is fully recovered, and my runs feel so much more enjoyable now - less pain after each run, knees and ankles actually feeling great the next day etc.
My next big challenge is a fell running course in Snowdonia 15-17th August (runsnowdonia.co.uk) where There Will Be Hills (!!).
I'll post about that experience when I get the chance!