I have a question for those of you who have been runners. My lower back gets very tight when I am running on the treadmill. Does this happen to everyone? Is there a way to stop this? Is it just because its on the treadmill or will it happen on the street too? Any help is appreciated. Sorry if I didn't do that right but trying to learn. I have been running a little over a year. I just "celebrated" the anniversary of my first two organized running events if you want to call it that. Since then I have learned so much and my input is running shoes are so very important just like the foundation of a building I would recommend going to a running specialty store at the least to find out what type of shoe you need and like if you don't buy them there you will know what to look for. Running form will help you go the distance. It's natural to slouch when fatigue starts to set in. That will start to cause the back pain try to run more upright it should help with that and also help you breath better.