Exercise! - Question to the Treadmillers

Hi everyone, I recently decided that more than anything I want to complete the nyc marathon maybe next year. I know that includes a lot of training and the capacity to be able to run for a very long period of time. Since its still freezing here, my only "training" can be done on the treadmill. Problem is: Whenever I start running I feel great, after about 5 minutes my calves lock up and a minute after that the pain becomes unbearable and I have to start walking immediately. Is this a training issue? Will I get over it eventually with consistency? Has anyone else had this problem? I feel pain no where else but my calves. Your assistance will be greatly appreciated. ;)

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!