I have a few suggestions...
1) Check your shoes.
2) If you are new to running, slow down and work your way up, your legs just might not be strong enough yet.
3) Try running on a slight incline.
4) Run outside in the snow and see if it still hurts, the treadmill may be having an effect on your stride. (I live in Ontario and I run outdoors most of the time... I only go to the gym after a snow storm or freezing rain)
Good luck on your marathon!
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