Day 7: OK, I'm going to state the obvious here: Seven days a week spent with a workout buddy who is not your BFF or your soul mate is too many. And even then, I'm dubious. We're both clearly getting tired of this routine and of trying to accommodate each other's schedules.

But I knew that going in. Seven days is a big commitment. The good news is that we're going to keep this up one or two days a week, and I'm really looking forward to that. It's fun being able to have some girl time, and it's motivating to push each other to step up our pace or to walk a little farther.