To add a few pointers:
~ Keep your chin pointed down a bit, toward your collarbones, rather than lifting toward the sky ( which puts more strain on on your neck).
~ DO NOT TWIST and TOSS the snow!! As much as possible, stay facing front- one can achieve this by stepping on one foot and then the other to change the facing of your body (sorry, this is very hard to write).
~ Alternate movements: Do not repeat the same movements over and over. Alternate which arm is higher on the shovel, and which foot is more to the front.
See your trusted bodywork practitioner on a regular basis!!!