orgin of Kung fu

The History of Chinese kung fu, beyond Bodhidharma, unheard by many...

It has been believed by many that the kung fu was developed by Indian buddhist monk Bodhi Dharma (in chinese Ta mo) at Shaolin Temple. But even the founders of Shaolin temple were masters in the deadly art of kung fu at that time they built the Shaolin Temple. Then how can we say that Bodhidharma had invented kung fu?...