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. Sunday: Easy 8-mile run on grass or dirt with friends. (400 Mile: 7 miles/300 Mile: 6 miles) Week 4 Total: 500 Mile–35 miles; 400 Mile–30 miles; 300 Mile–21 miles Mo. 1 Total: 500 Mile–134 miles; 400 Mile–108 miles; 300 Mile–90 miles Remember to post your miles on www.500MileChallenge.com - See more at: http://runningnetwork.com/RNW/index.php/features/training-tips/saucony-500-mile-challenge/6560-saucony-500-mile-challenge-week-4-sunday#sthash.CcRsdDRB.dpuf