Made it to a full 5 miles the other night. It was a little cooler so that helped. When I started out I felt tired and actually thought about cutting it short but the longer I ran - and ran through my desire to stop - the more energized I felt. I relaxed as best as I could and paid attention to my legs and hips. I experimented with using relaxation as I ran so that my body felt less strain putting one foot in front of the other and pumping my arms back and forth. Moving my legs forward I relaxed the muscles in my hips and quads as soon as I could while still extending my legs in a reasonably good running stride. I did the same with my arms by relaxing my shoulder and holding my arms as loosely as I could while still maintaining a natural running rhythm. In other words I used as little muscular effort as possible while breathing naturally and deeply. It seemed to make all the difference in the world. I also started with a slower pace.