Liu Ziyuan practices Shisuo techniques in Nanjing, east China's Jiangsu Province, May 11, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Shen Ershun practices Shisuo skills at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Photo taken on June 5, 2019 shows students from the Shisuo club at Qingshuiting Primary School in Nanjing, east China's Jiangsu Province. The club has 12 students ranging from the third to the sixth grade. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Liang Zhenxin (3rd R) and a group of Shisuo lovers who age 75 years old and above practice at Yixian Bridge in Nanjing, east China's Jiangsu Province, June 5, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Sun Yuping practices Shisuo exercise at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. 78-year-old Sun joined a Shisuo team five years ago and gained not only a stronger body but lots of friends. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Photo taken on June 4, 2019 shows 78-year-old Sun Yuping watching people doing the Shisuo exercises through the window at her home in Nanjing, east China's Jiangsu Province. She joined a Shisuo team five years ago and gained not only a stronger body but lots of friends. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Photo taken on June 4, 2019 shows a 20kg Shisuo colleted by Wang Daoquan, the inheritor of Shisuo, in Nanjing, east China's Jiangsu Province. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan, the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province presents the book introducing Shisuo in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Students of Shisuo club practice Shisuo in the morning activity class at Qingshuiting Primary School in Nanjing, east China's Jiangsu Province, June 5, 2019. The school has a Shisuo club with 12 students ranging from the third to the sixth grade. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan (Front) , the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province prepares to practice Shisuo exercise at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

78-year-old Sun Yuping (3rd L) watches members of Tianyin Shisuo Association practice Shisuo exercise in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

78-year-old Sun Yuping (1st L, Front) and her Shisuo team members pose for photos at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Photo taken on June 4, 2019 shows Wang Daoquan, the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province and a 250kg weighted Shisuo at Yinxiang in Nanjing, east China's Jiangsu Province. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan, the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province practices skills of Shisuo exercise at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan (R) , the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province teaches students of Qingshuiting Primary School Shisuo exercise in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Aerial photo taken on June 4, 2019 shows 78-year-old Sun Yuping practicing Shisuo exercise at Yinxiang in Nanjing, east China's Jiangsu Province. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan (C) , the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province talks with Shisuo lovers at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

78-year-old Sun Yuping cheers for members of Tianyin Shisuo Association in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Sun Yuping (C), 78, performs Shisuo skills in Nanjing, east China's Jiangsu Province, May 11, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)

Wang Daoquan, the inheritor of Shisuo, the intangible cultural heritage of Jiangsu Province practices skills of Shisuo exercise at Yinxiang in Nanjing, east China's Jiangsu Province, June 4, 2019. Shisuo (stone lock), a stone dumbbell in the form of ancient padlock, is usually seen in the traditional Chinese workout routine. With hundreds of workout moves, Shisuo exercise can not only enhance strength, but also help people to coordinate hands, eyes and the body. Shisuo dates back to the Tang Dynasty in which soldiers first used it to build their bodies. The Shisuo exercise has a long history in Nanjing, east China's Jiangsu Province. Endearing itself to the public in recent years, Shisuo becomes a national fitness activity. Nearly 20 Shisuo teams are formed for regular activities and competitions. (Photo: Xinhua)