The Bulgarian Bag was invented by Ivan Ivanov at around 2005. Ivanov, a former Bulgarian Greco-Roman Olympic athlete, was working as a U.S. Olympic Greco-Roman wrestling coach at the Olympic training center in Marquette, Michigan and was looking for a training tool that would allow his wrestlers to improve explosive actions and dynamic movements involved in pushing, twisting, swinging, pulling, bending, rotating, squatting, lunging, and throwing.
Ivanov was inspired by the tradition of shepherds performing strength acts with sheep and goats on street fairs in his native Bulgaria. The shepherds were often forced to carry lambs and weak sheep around their shoulders when they were wandering with their herds, and were showing off their strength at festivals. Ivanov based the design of his tool on the body of an ovine and saw its use as a modern interpretation of the old tradition.That is last week's Virgin Active mystery solved then John. "Ivanov was inspired by the tradition of shepherds performing strength acts with sheep and goats on street fairs in his native Bulgaria." Obvious really, in hindsight.