Five Energies Meditation

Every day you should spend from twenty minutes to two hours harmonizing and adjusting your internal energy. If you can balance your emotions, you will have no anger or sadness and will not be easily excited. In doing this Five Energies meditation, it does not matter what position you sit in, but it is important that you are not disturbed during the time that you do it. So unplug your telephone.
As you sit, you correspond a specific color to certain internal organs. Begin with the heart and visualize red Ch’i or a soft red cloud that is transformed from your heart and watch it carefully with your internal vision. After a few minutes, watch the red cloud move to the area of the stomach and then gradually change to become yellow. This is a pure mental practice; you need to do it until there is no “me,” only clouds. From the stomach, the cloud moves up to the region of the lungs, expands to cover both lungs, and becomes white. Then, after a while, the white cloud sinks down to the kidneys and bladder where it becomes dark, like the water of the North Sea, deep, dark blue with a little gray in it. This cloud surrounds all your water organs and then moves up to the liver area just to the right of your spleen and gallbladder. When it comes to this region, it changes from blue-black to green. From here, you can begin the cycle over again by moving the green cloud to the heart where it becomes red, and so forth.
Do this cultivation calmly and gently, following theorder I have given you. Do not change the order. Water gives birth to wood energy, which gives birth to fire; fire gives birth to earth, and earth gives birth to metal; metal gives birth to water and the cycle repeats itself. By your visualization, you burn away negative energy, and your internal movements harmonize your sexual energy beautifully. People are made of living energy. Someday the physical house of your soul will die, but these five clouds will be your new home that can carry you flying. The minimum goal of this practice is to fortify your energy and balance yourself.
Be gentle when you do it; be gentle when you stop it. After several circulations, you should take a break or stop. If you have done the circulation for two hours, then slow down before you bring it to a close. Collect your energy back to its original order. just calm down. You do not need to use strength to do it. Use your gentle mind.
The second stage of the Five Cloud Meditation is to sit quietly and visualize the center of the chest or the area one half inch above the navel. I recommend that women use the point in the center of the chest.

Reference:
Entering the Tao by Master Huang Ni