Running with bricks on my feet

This afternoon, after work I went for a run here in Republic. As I was running, I felt very tired from the start. I was able to run over 3 miles, but I had to stop and walk several times. The temperature was about 73 at my run time. I literally felt like I was running with bricks tied to my shoes. My ipod battery was too low to use, so I carried my cellphone and played the mp3s on it.