Thank you. I didn't know you could damage your kidneys, or any organ from chi? I'll try to be careful. Also should I combine this exercise with meditation?
I'm sorry to hear about your abduction. These Aliens certainly didn't have your best interest in mind, mutilating you like that.
Seems like you over did your exercises, if you can't look people in the eyes? I wanna try to avoid that.
Quoting: Anonymous Coward 28765867 This exercise is in itself, meditation. No need to combine anything. It is actually far more powerful than sitting meditation..
No need to be sorry, they didnt mutilate me at all.

The kidneys can be damaged, due to the stimulation of the fight or flight response, which causes the kidneys to produce massive amounts of energy, if overdone, can injure the kidneys possibly permanently. The kidneys store the life essence, "jing" which if depleted, does not replenish. This determines lifespan, and many other things.
When the life force is depleted, the bones harden, skin hardens, aging happens rapidly, the bones become brittle, the muscles have no energy.. etc.
Its not likely that an average person could injure themselves in this way, it would take an extreme amount of effort.