The nail Jori are usually lighter than competition Joris swung on ethe shoulders. The emphasis is on wrist and hand strength, co-ordination and intense mental focus. The style used is also the favoured style performed by wrestlers who generally use lighter weight Joris emphasising speed agility flexibility and increased gripping power. 

Swinging Nail Jori is always an interesting experience, you can hear the whistle of the air being parted by the nails as they swing past your ears and head and there is a high likely hood of scratches or indeed a puncture wound. All of this adds up to performing an exercise you could normally get away with sloppy technique and makes it one where the only technique is the good kind. Or else!