Hi guys, I must be coming up to about 5 months of training, specifically running. I have had issues with my running from day one. I used to smoke and drink quite a lot and working night shifts I was never too health conscious. I still am coming short of my second run! I always seem to have bad pains in my knees and when I run through it I can barely walk after. My running has come a massive way from when I first started, I could barely run 1.5 miles without seeing the light at the end of the tunnel, now I’m considerably better, but still really need to improve as I really don’t want to fail my PJFT again. Can anyone offer any advice on how to improve my cardio?