For a whole day, Lin Feng was practicing the method of concentration.

The method of concentration sounds mysterious and unusual. In fact, when Lin Feng really began to learn, he found that it was not as mysterious as he had imagined.

Compared with mystery and wonder, the method of concentration is more like a summary of experience.

Lin Feng has been able to feel the essence since he began to practice it. Essence can really improve people's physique. This kind of promotion is all-round, as if the essence is a very powerful tonic for human body, it can make people strong and strong.

Of course, this essence is not a...