Everyday runner Fang Bo finished second at the 2026 Shijiazhuang Marathon in 2 hours 13 minutes 31 seconds, improving his personal best by 4 minutes. From his past four months of training data, we can glimpse the secrets behind his PB. Last year Fang Bo set a PB of 2:17:34 at the Wuxi Marathon, but made no breakthrough in the second half of the year, so he went to the Yunnan plateau for winter training. From December of last year through now—four full months—how many kilometers did he run in total? What was his monthly mileage? In December last year, his monthly mileage reached 978 km, training duration 65 hours, average pace 4:00/km, average heart rate 142 bpm. 30% of training time was in the lactate threshold zone, followed by the aerobic power zone and the active recovery zone. In January, monthly mileage was 953 km, training duration 64 hours, average pace 4:02/km, average heart rate 150 bpm. Nearly half of his training time was in the aerobic power zone. In February, monthly mileage rose to 1,224 km—an average of 43.7 km per day, more than a full marathon. Average pace 4:07/km, average heart rate 144 bpm. The primary training zone was the aerobic power zone. March was race season. As of today, monthly mileage is 926 km, average pace 4:04/km, average heart rate 147 bpm. The main training zone was the aerobic power zone, followed by the lactate threshold zone. Over the four months of winter training, Fang Bo ran a total of 4,082 km, averaging over 1,000 km per month—specifically 1,020 km. It was this large winter accumulation that produced rich results in three races across three weeks at the start of spring. Renshou Half Marathon: 1:05:11, new PB; Wuhan Marathon (half-marathon): 1:07:20, men's champion; Shijiazhuang Marathon: 2:13:31, new PB, finished second. Looking at his Shijiazhuang Marathon data: official gun time 2:13:31 (the watch recorded one second more), average pace 3:09/km, total elevation gain 97 m, average equivalent pace 3:08/km, average heart rate 170 bpm — compared with his training heart rates, this is indeed very high. #Fang Bo #marathon #Shijiazhuang Marathon #TrailRunningBigBang