The difference between simplified Tai Ji Chuan and traditional Tai Ji Chuan lies in: traditional Tai Ji Chuan was fought on the battlefield; Simplifying Tai Ji Chuan is for city people to keep fit. Traditional Tai Ji Chuan combines rigidity with softness; Simplifying Tai Ji Chuan should be soft but not rigid. For example, the dragon comes out of the water, the arm hammer, the heart-protecting hammer, the whirlwind foot and the pedal can't be found in the simplified Tai Ji Chuan, let alone the movements in the cannon boxing. In addition, don't think that Tai Ji Chuan is slow and doesn't work hard. This is a misunderstanding of Tai Ji Chuan. Can you imagine not hitting people hard?