Stone Lock Training Methods from Kaifeng,Henan

The Stone Lock(石锁Shi Sou) is an age old strength exercises which was very popular among Chinese Martial Artists. Today it seems to be mostly practiced by Shuai Jiao Practitioners and the Hui People(回族). The Hui are a Ethnic Minority who are Muslims. Popular Chinese Martial Arts practiced by them are the Cha Quan, Baji Quan, Xinyiliuhe Quan and the Pigua Quan. Some might see a connection between the Stone Lock and todays Kettlebells, but to draw a direct connection seems not possible through resources. By looking at them they seem also similar to me. So maybe the stone lock is the Ancestor of the Kettlebell or the maybe are paralell invenstions.(Does have anyone different infos on that? ). I also read the other Ancient countries like the Greeks had similar training tools. It seems also not clear when the Stone Lock orginated in China.I read sources that say it was invented during Han Dynasty, or others even saying that it was already their in Xia Dynasty. Others spoke about orginating in Mongolia. This Demonstration is from Kaifeng in Henan. This is the Capital City of Henan Province. If anyone has further knowledge on this subject I would be pleased if you share. Thank you.