Hi there. I have just started running and will be doing my first 5K at the Race for the Cure and then will be doing the Minnie 5K. I have tried running several times but never had any stamina. Since it's been cold here in the midwest, I have been running on a treadmill. In the past I have never been able to run more than about 5 minutes at a 4 mph pace. For some reason this time around I have been able to run much easier. I can run 45 minutes at 4 mph (about a 5K) or 30 minutes at 4.5 mph on the treadmill. However, running outside is a different story!! I tried to run outside the other day and could only run about 2 minutes before I was totally winded and my legs felt like they were going to fall off. I know that running outdoors is more difficult than the treadmill but I can't understand how I can go for so long on the treadmill and than not even function outdoors. I feel like I am still running slow outside but my DH wonders if I am running way too fast since I'm not paced by the treadmill outside. Any suggestions? I'm starting to get really worried!