Today on the First 40 Miles, TWO: The Couples Episode.  If you’re hiking or backpacking with your significant other, there are some great benefits—and some relationship pitfalls.  We’ll do our best to share some helpful information for how to include your spouse in your next backpacking trip.  Then, on the SUMMIT Gear Review, we’ll share a pair of shoes that will help you get through better or worse.  On the Backpack Hack of the Week, a tweak to your sleep system that maximizes your heat output.  And we’ll wrap up the show with a little trail wisdom that just may save your relationship.