Firstly excuse me if i've spelt cruciate wrong! I'd been tryin to get my running distance up to 3 miles, i achieved this, then what i thought was my knee, started playing up. It felt like something grating/clicking to the outside of my knee. I was reliably informed by a PTI that i was a cruciate ligament that was too weak, i unfortunately am a bit on the skinny side and i did try increase my run distance quite quickly. he said i needed to build up the muscles around the ligament to support it. He suggested bike riding as it is less high impact and one else experienced what i've mentioned and know any other good ways to strengthen my lanky pins!! many thanks F.I.