Sir I know 4 miles is nothing...By the time I leave my goal is to do 18 miles with a 55-60 lb rack. Anything more is excess and cause for injury (that's your advice). I was merely doing the 4 miles today in order to "break in" the boots since they are new and according to "the book" by warrior mentor your intial ruck should be no longer than 4 miles. If it was up to me I would of walked myself into unconsciousness. Gradually I will increase distance and weight (crawl, walk, run). I was merely stating my situation and technique to make sure I had no flaws and could starting logging in miles and toughing my feet. Thank you.
-John
casket or tab.