How to Survive Falling Through a Hole in the Ice

It is winter. You are panting with fatigue because for the past 30 minutes you have been running and walking through knee deep snow attempting to evade a group of marauders.  You come to the edge of a clearing. Normally you would skirt around the edges, but that would take time. You decide to risk a straight path across. A hundred feet from the edge of the woods, you hear a large "crack". As you plunge through the ice, you realize it was not a clearing, but a frozen lake. What do you do?

The Art of Manliness has an infographic on surviving a fall through the ice, and some additional advice at the link. Check it out.