C.g of human body?

Do you mean the centre of gravity of the human body?

This is dependent on the position of the body, but when at rest it lies approximately anterior to the second sacral vertebra. However, since human beings do not remain fixed in the anatomical position, the precise location of the centre of gravity changes constantly with every new position of the body and limbs. The bodily proportions of the individual will also affect the location of the centre of gravity.