Fifty miles is not a long marathon. It is a day spent running on legs that stopped being fresh hours ago, and that is the specific thing this plan trains. Twenty-four weeks, 5 running days, and a weekend pair that is the spine of all of it. Saturday is your long run and Sunday is a second long run on top of it. Anyone can run 25 miles rested. Running 12 the next morning, on legs that have not recovered, is the skill a 50 miler actually asks for, and it is why this plan is built in pairs rather ...