What is a Lakota tradition?

A typical lakota tradition is the sun dance this is where a person from the tribe will be stored, starved and basically tortured. When they are being stored this is when they will be placed in a room with no food for several days and told to pray. Because of lack of food this will make them sweat which they believed to be sweating out there sin (bad side). After a few days then they would be taken outside and been cut open on the neck where they would thread a piece of rope through and then tied to a tree. Once all this had taken place then they would be forced to dance around a tree. Obviously the person would die (i cant really see the point behind but who am i to argue).