Team Strong Silvers member Ngai Hin Kwok, 66, works out as teammate Ng Siu Chi, 57, watches at a stadium in Singapore March 15, 2015. Team Strong Silvers, is a group of senior citizens who train in calisthenics. The trio trains individually at least three times a week, and meets up for joint calisthenics at least twice a month. (Photo by Edgar Su/Reuters)

Ngai Hin Kwok, 66, part of a trio of senior citizens who train in calisthenics, works out at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)

Ngai Hin Kwok, 66, part of a trio of senior citizens who train in calisthenics, works out at a stadium next to youths at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)

Ng Bee Kia (L-R), 70, Ngai Hin Kwok, 66, and Ng Siu Chi, 57, who form Team Strong Silvers, a team of senior citizens who train in calisthenics, work out at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)

Members of Team Strong Silvers, Ngai Hin Kwok, 66 (C), hangs from the right arm of Ng Bee Kia, 70, as Ng Siu Chi (L), 57, watches during training at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)

Ng Bee Kia (bottom to top), 70, Ngai Hin Kwok, 66, and Ng Siu Chi, 57, who form Team Strong Silvers, a team of senior citizens who train in calisthenics, perform stacked push-ups at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)

Ng Siu Chi, 57, part of Team Strong Silvers, a trio of senior citizens who train in calisthenics, works out at a stadium in Singapore March 15, 2015. (Photo by Edgar Su/Reuters)