Excuse me, what are the names of the two balls played by the old man? What are the benefits?

Baoding iron ball, also known as fitness ball. The advantage of playing fitness ball is that it can dredge channels and collaterals, strengthen tendons and bones, reconcile qi and blood, and can also prevent and treat chronic diseases such as numbness and trembling of hands, inflammation of fingers and wrists, hypertension and hemiplegia.

Baoding iron ball is a traditional folk handicraft in Baoding, Hebei Province. At first, it was only circulated among the people as a kind of enjoyment or protective equipment. In the Ming Dynasty, there was a kind of stove specially made iron balls. The popularity of iron balls attracted the attention of the imperial court and began to collect tributes from the people. Blacksmith artists with unique skills were called into the palace to make iron balls for the royal family and dignitaries to enjoy. It is also a favorite sports equipment of Baoding people.

Baoding iron ball has a long history. At first, it was only circulated among the people as a kind of enjoyment or protective equipment. In the Ming Dynasty, there was a kind of stove specially made iron balls. The popularity of iron balls attracted the attention of the imperial court and began to collect tributes from the people. Blacksmith artists with unique skills were called into the palace to make iron balls for the royal family and dignitaries to enjoy. Baoding iron ball was originally? Solid ball, a court blacksmith in Qing Dynasty introduced music into the production of iron ball in order to eliminate the loneliness when playing iron ball, and changed the solid ball into a hollow iron ball with sound. The so-called "Baoding three treasures, iron balls, batter, spring is not old", and iron balls are the first of the "Baoding three treasures". Middle-aged and elderly people in Baoding especially like to play iron ball. Generally, they play with two iron balls in one hand to relax their muscles and keep fit.