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So, I used to run a lot when I was a teen and got a glut injury (as I didnt think I needed to stretch!) when i was about 20... I sorted that out and it went away... then I had no problems until about 5 years later (I'd run frequently for 4 of those years, but did nothing in the 5th year)... I noticed that after running for a period my knees started to seize up. There was a circuit of about 2km that I used to run weekly and I noticed that every single time i did the run, right towards the end at the same point my knees would seize up. I would stretch them out (pulling my leg back so my heel is on my lower back) and then finish off the short distance remaining.
So, I never really gave it much thought until about 2 years ago when I decided to go on a long distance run. After about the same distance as usual my knees seized, 'no problem' i thought, this usually happens and after a quick stretch I would be on my way again. Well, that day I ran 8 miles (stopping periodically to stretch my knees) running through the pain (which i now realise is stupid) until i could barely take a step further (going uphill was virtually impossible by the end). So I ended up walking back, which was comfortable (unless it was uphill).
I then found that each time I tried to go on a run, my knees would seize up but after a very short distance.. and when they seized up, it was as though someone was injecting concrete into them or strapping some kind of metal lock over each knee, meaning I could barely take another step (again, walking was painless - as was every day life).
It's now about two years on from that 8 mile run and I appear to be back to where i was previously, stuck at about 1.5 miles. I can run totally comfortably up until this point. Then when i reach it BANG! In goes the concrete into the knees and I can barely take another running step. I can stretch out and then do another 100 metres or so, but that's the max.
I have recently been doing a huge amount of leg stretching and leg weights (squats, lunges, all the leg machines) as I was told by a physio that i had weak thigh muscles and tight hamstrings... but after all the work i have put in, out i go on a run today and nothing has changed whatsoever...
I have also signed up to the London Marathon in April! So I am really against it... if anyone has any wisdom for me, I am desperately keen to hear it.
Sorry for the massive essay on my running life, but I thought the more info the better.