The way in which we use our muscles, bones and tendons and limbs is of the greatest importance here. Balance is one of the most important factors in kung-fu as we have to maintain the best possible stance in order to not be attacked and put down. Whether we are stationery or moving balance must be taught. We have to look at how low the stances are to improve balance, how the feet are placed on the ground and how much energy is in the upper and lower portions of the body. We must look at ways to increase endurance when standing in the one position for some time and also endurance when moving around in quick spurts for some time and greater balance plays an important part in evenly distributing the weight and balance.
Balance is related to the position of the centre of gravity.
Quick movement is attained in the lower position by shifting he weight onto the balls of the feet so that centre of gravity is now positioned close to the perimeter. A person's centre of gravity can be upset by either pulling at their upper body to upset the stability or by attacking the lower body to pull their base away. Quite often we will see both linear and angular movement interrelated and in particular in kung-fu. For instance we will not only punch using a forward motion pushing from the rear to front foot but also at the last millisecond twist the waist so that the arm is shot out at great speed adding to the linear thrust. We are able to calculate the linear velocity V, by multiplying the radius of rotation r', by the angular velocity.