qigong - How is Qi Energy used in Buddhist practice?

Ive seen television programmes and videos of buddhist shaolin monks who perfom incredible techniques such as breaking iron bars with their heads, impaling themselves with spears, throwing needles through glasses windows etc.It was said that these monks create, harness and use Qi Energy which makes it possible for them to perform these techniques. I have two questions:What is this Qi Energy? Is it a strong and profound level of concentration like the Jhanas in Theravada Buddhism?Thank you for your time.Click on photos for full size...Read more