For today’s edition of Dear Mark, we’ve got a two-parter. First, I cover why our desire for carbohydrates might increase in cold weather (hint: it’s probably all the shivering our muscles do in an attempt to stave off the chill). Second, I discuss why a military man might be losing muscle mass when out in the field, despite (or, perhaps, because of) all the hard physical work he’s doing. Even if you’re not military, the answer will likely still be helpful. And after that, Carrie lends a bit of sage advice to a reader who ends up with debilitating pain in her thighs every time she does high intensity plyometrics. The answer may not be what she had hoped for, but it’s probably the right one.