An outdoor gymnasium on Hero Mountain has become highly popular among senior citizens in Jinan, Shandong province who love working out.

The gym, which was founded by local fitness enthusiasts in 2016, features fitness equipment made by hand.

Ding Peixin, also one of the founders of the gym, said that most of the people who visit the fitness corner are elderly people aged over 50. Every day, the gym attracts more than 300 people.

A local resident surnamed Mu exercises with homemade dumbbells. The dumbbells are made of cement. [Photo/iqilu.com]

Mirrors have been installed in front of some fitness equipment in the outdoor gym so that fitness enthusiasts can observe their movements as they work out. [Photo/iqilu.com]

There are various kinds of fitness equipment in the outdoor gym, such as dumbbells, barbells, sandbags, and rings. [Photo/iqilu.com]

 Bei Youren, who is in his seventies, has become well-known among fitness enthusiasts for his hand stance. Bei exercises for at least two and a half hours a day. [Photo/iqilu.com]

A resident surnamed Zhai, who is in his eighties, exercises at the gym on Hero Mountain. He can easily lift out a barbell weighing 102 kilograms.  [Photo/iqilu.com]