Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen watches skiing video of his own at home in Changchun, capital of northeast China's Jilin Province, July 29, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Luo Yuan)

Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen prepares for windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen (L) plays roller skiing in Changchun City, northeast China's Jilin Province, July 27, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays roller skiing in Changchun City, northeast China's Jilin Province, July 27, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen (L) plays roller skiing in Changchun City, northeast China's Jilin Province, July 27, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen (L) prepares for windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen practises skiing at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Luo Yuan)

Cai Hongwen plays roller skiing in Changchun City, northeast China's Jilin Province, July 27, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen checks his skis at Beidahu in Jilin City, northeast China's Jilin Province, Jan. 26, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays roller skiing in Changchun City, northeast China's Jilin Province, July 27, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)

Cai Hongwen plays windsurfing at Songhua Lake in Jilin City, northeast China's Jilin Province, July 28, 2020. Cai Hongwen is a 65-year-old sports enthusiast living in Changchun of Jilin Province. In order to improve physical fitness, he has kept on practising skiing, windsurfing, horse riding and other sports for years. For Cai, doing sports is a good way to achieve self-challenging and self-breakthrough. (Xinhua/Xu Chang)