This 10-week plan was designed by the experts at Runner's World for runners who want to break 2:15 in the Half Marathon. It's geared for runners who have been running consistently for several years and who regularly log an average of 18 to 20 miles per week. It features two or three days of rest and four or five days of running each week. It includes long runs and plenty of race-pace miles to help you easily get into rhythm on race day. There's a long run each week, which starts at eight miles in week one and peaks at 13 miles.