Cathy Guisewite, responsible for the comic strip "Cathy," has now released a memoir. One of its more charming features is occasional lists of reasons not to exercise. So, joining the fun, I'm recalling, here, the things I tell *myself* to get out of a run: *I'm tired! *The seven-minute walk to the train station is really *like* exercise; it's exercise in disguise. *Yes, my mood is down, but I'll leave this particular desk job in approximately fourteen months, and I can tolerate low endorphins till then. *My thighs chafe. *The temperature outside is anything other than 74 degrees Fahrenheit. *At thirty-six, I'm concerned about knee ailments. Yep! These are the contents of my head. Your own excuses are most welcome here!