This week, runners taking the 500 Mile and 400 Mile challenges begin running daily. Advanced athletes should add a 20–25-minute session (3 miles) of easy running on Monday, Wednesday, and Friday. Do these runs at the opposite time of day that you do your hard workout. Monday: Warm up; 5-mile run (400 Mile: 4 miles/300 Mile: 3 miles); 3x150 yds relaxed strideouts on grass, jogging back to the start after each, no rest between; cool down. - See more at: http://runningnetwork.com/RNW/index.php/features/training-tips/saucony-500-mile-challenge/6554-saucony-500-mile-challenge-week-4-monday#sthash.eQd2nJty.dpuf