Xu Wei, a 63-year-old former factory worker and the current gym manager, show his muscles at the gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Self-made iron dumbbells are seen at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Cutouts of famous bodybuilders are displayed on a wall inside a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Xu Wei, a 63-year-old former factory worker and the current gym manager, exercises with a self-made barbell at the gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Cutouts of famous bodybuilders are displayed on a wall at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Zhao Shuyuan, 61, suspends himself in the air using a horizontal bar at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Tian Fenggang, 65, carries his pet birds as he leaves a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Men work out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Zhao Shuyuan, 61, exercises at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Men work out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

A man works out with self-made equpiment at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Liu Hongtao, 53, is seen in a mirror as he works out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Zhao Shuyuan, 61, shows his muscles at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

A pet bird which belongs to a bodybuilder is seen in a room next to a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Zhang Yue, 63, works out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Wang Guofu, 59, drinks tea as he takes a break after working out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Yang Hongzeng, 82, uses self-made dumbbells as he works out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

He Chunsheng (L), 66, and Liu Hongtao, 53, play Chinese chess in a room next to a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Zhao Shuyuan (L), 61, and Yang Hongzeng, 82, work out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

A man works out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Liu Hongtao, 53, works out at a gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang 

Xu Wei (L), a 63-year-old former factory worker and the current gym manager, works out at the gym which has been turned from a bicycle shed inside a residential compound in the southwest of Beijing, China April 8, 2021. Picture taken April 8, 2021. REUTERS/Tingshu Wang