Here is How:
It's also fine to sit in a cross-legged position on a cushion of the floor, if this is comfortable for you.
Here's how: First, close your eyes gently. Then exhale completely, and with your inhalation, imagine that you're drawing into your liver a beautiful emerald-green light.
With each inhalation, draw into your liver this beautiful emerald-green light. With each exhalation, simply notice the liver's "virtue" of loving-kindness. This is a quality that already exist within you. We're simply using a particular frequency of light to nourish it, to invite it to reveal its full splendor to us.
How to build up Chi (Qi) to fight off illness and maintain good health
Zhan Zhuang - foundation of Internal Martial Arts