Thanks for your reply, I used to race for a local club and even managed a 1/2 marathon, took me quite a while though, then I moved and it just gradually got less and less. It has been about 6-8 months since I was running at the gym although I have been doing cycling through the summer. I am only doing a top speed of 10kph during my intervals. Do you think I should build my base running up again first?