With what we know as far as manual stretches,hanging and different types of girth work, I think that if one implemented the tribesman technique after such workouts, you would have a nearly perfect routine in my opinion! The problem is having a device that will generate enough pull, but yet not cut off the blood flow, and also be comfortable to wear during the day and at bedtime!
I don't feel that these tribesman walked around with very heavy weights, as this would interfere with there daily routines, hunting, working around the village, etc. It would seem more likely that they hung just enough weight so as to have a pull stronger than what the PC muscle could hold! In saying this, even if the PC muscle could keep the weights pulled up, eventually it would tire, and yield to the force of the weight pulling down. Then gravity would take over! But maybe the devices that they are wearing are just as uncomfortable as the modern day stretching devices that are on the market! The only difference is that this is part of their tribal customs, and also they probably have a high threshold of pain resistance, as they live a rough and hard life compared to a modern man!
I for one am working on a device that will hopefully accomplish this! I will continue to manual stretch, hang, and work my girth, but when I'm not doing my routines, I will be following the footsteps of the tribesman! !000's of year of doing this, can only mean that it's been tried and tested, and proven a success!
Girthius