BUT FIRST—   Last week I introduced a new series on preparing for your world travel adventures. In that post, I invited you to step out of your comfort zone, broaden your horizons beyond your usual athletic activities, and allow me to be your guide as you embark on traveling the world. I also told you about some of the great once-in-a-lifetime trips that have inspired my lifelong love of travel. Depending on how your health may, or may not, align with your travel dreams and adventure plans, before you head out the door to aggressively train in the nearest hills, let’s discuss preliminaries (yes, boring stuff, I know!). Some…