Amos Serem of Kenya competes during the men's 3000m Steeplechase final at the 2021 World Athletics U20 Championships in Nairobi, Kenya, Aug. 22, 2021. (Xinhua/Li Yan)

Athletes compete during the men's 3000m Steeplechase final at the 2021 World Athletics U20 Championships in Nairobi, Kenya, Aug. 22, 2021. (Xinhua/Li Yan)

Athletes compete during the men's 3000m Steeplechase final at the 2021 World Athletics U20 Championships in Nairobi, Kenya, Aug. 22, 2021. (Xinhua/Long Lei)

Athletes compete during the men's 3000m Steeplechase final at the 2021 World Athletics U20 Championships in Nairobi, Kenya, Aug. 22, 2021. (Xinhua/Long Lei)

Amos Serem of Kenya celebrates after the men's 3000m Steeplechase final at the 2021 World Athletics U20 Championships in Nairobi, Kenya, Aug. 22, 2021. (Xinhua/Li Yan)