Calvin and Hobbes by Bill Watterson for December 27, 1995
Calvin: The new issue of Chewing tells how to stay in top chewing condition over the winter! Hobbes: What's so hard about that? You can chew gum all year. Calvin: We serious chewers need a lot more than strong jaw muscles, you know! To chew hour after hour, we need a total cross-training fitness regime! Hobbes: So the idea is to increase the amount of this hobby you can endure. Calvin: Right. When you're good at it, it's really miserable.