Today on the First 40 Miles, a hiker, a backpacker and a biomechanist all walk up to a bar.  What they do next might just surprise you.  On today’s Top 5 List, we’ll talk about how another podcaster we listen to has changed---nay---revolutionized the way we move.  Then we’ll review some stretchy pants that allow freedom of movement along with the power of wool.  For today’s Backpack Hack of the Week, a movement hack provided by Katy herself.