You can see Qi is energy and is found in heaven, in the earth, and in every living thing. All of these different types of energy interact with each other and can convert into each other. In China, the word "Gong" is often used instead of "Kungfu" which means energy and time. Any study or training that requires a lot of energy and time to learn or to accomplish is called Kungfu. The term can be applied to any special skill or study as long as it requires time, energy, and patience. Therefore, the correct definition of Qigong is any training or study dealing with Qi that takes a long time and a lot of effort.