Judo is a modern martial art, (it means “gentle way”) it was created as a physical, mental and moral pedagogy in Japan, in 1882, by Jigoro Kano and later evolved into a combat and Olympic sport
Judo techniques enable a weak and small man to overcome a large and strong man because they are based on scientific principles such as leverage and balance.
The first thing to learn is never to oppose strength to strength. If you do that the stronger man will inevitably win.
Remember that when he is on balance he is strong, but off balance he is weak, providing you have retained your own balance to take advantage of his weakness.
The second principle you should understand and think about is the action of levers. You know how much easier it is to lift a heavy object by putting a crowbar under it.
Judo teaches us to use the opponent’s forces against him, such as gravity and momentum. The understanding of this concepts have proved to be very effective not only in combat, but in negotiation techniques as well as many other aspects of life.