#newtorunning

I am less then happy with my morning at the gym.  I always start my workouts by stretching, then i run on the treadmill. Today when I got almost to the mile mark my legs began trembling and were very painful.  Now I am no trainer so i paused the treadmill just thinking I needed to stretch more so I did.  But when I started to run the pain returned so I just stopped running. I still workout in other ways. Tried some new stuff.  Any idea on why my kegs hurt so bad? Am I just pushing myself to much yesterday I ran/walked in intervals for 1 hour I didn't think it was to much, is it?