Hi, I did a quick search and nothing really came back so I was wondering if anyone could help me? I've been running on and off for over a year or so now on the treadmill, usually just doing about 5k but on occasion running 10k at a comfortable pace for me but as the weather is getting cooler and I am about to move back to the UK, I figured I would take to running round the compound where I currently live until I get back home and start running round the city and parks. Sounds good, however I am feeling it hard within minutes even though I feel I am around the same sort of pace I maintain on the treadmill for a steady run. I'm not sure if it is the heat or humidity (I'm on the east coast of Saudi) but its demoralising really. I'm by no means an athlete but I wouldn't consider myself a lazy unfit slob either, but after years of avoiding any exercise I could, I am currently trying to get 'army fit' and I thought I was on course to achieve this until recent outdoor runs. With this in mind, can anyone suggest any hints or tips that might help me out here? Has anyone experienced something similar?