I have been running 5k for a couple of weeks now though at a pretty slow pace (35 mins, including a 5 min warm-up walk). Today I felt pretty good so decided to keep going at 5k. I stopped at 55 mins, 8k covered. I now need some advice - should I concentrate on getting my speed up and stick to 5k or should I train for 10k? Also, how do I make the transition to outside running? I had a go last week and failed - my breathing was all over the place and I ran at a slower pace than on the treadmill. I only managed a 10 min run before I had to take a 2 min walking break. Any advice gratefully received!