TCM explanation based on virtually total ignorance about physiology and anatomy, itself probably inherited from the ancient Greeks, who had similar beliefs about the balance of humors regulating health. Chi has been extensively investigated scientifically and found completely unproved, for which read non-existent.
Please cite the studies where this was done.
It's not my intention to prove whether or not chi exists, however, keep in mind that the term is often poorly translated, defined, or purposely misused by charlatans who cater to Westerners jedi fantasies.
If by "organ strengthening" you mean "more efficient", then, again, prove it instead of making faith-based claims.
Many of these Eastern practinces (qigong's) HAVE been documented to make the organ and other body systems "more efficient".
Benson developed the "relaxation response," which he describes as "a physiological state opposite to stress." It is characterized by decreases in metabolism, breathing rate, heart rate, and blood pressure . He and others have amassed evidence that it can help those suffering from illnesses caused or exacerbated by stress. Benson and colleagues use it to treat anxiety, mild and moderate depression, high blood pressure, heartbeat irregularities, excessive anger, insomnia, and even infertility .
The researchers also made measurements on practitioners of other forms of advanced meditation in Sikkim, India. They were astonished to find that these monks could lower their metabolism by 64 percent. "It was an astounding, breathtaking [no pun intended] result," Benson exclaims.
To put that decrease in perspective, metabolism, or oxygen consumption, drops only 10-15 percent in sleep and about 17 percent during simple meditation.
This is one example of a scientist actually measuring the effects of what the Chinese would call 'chi'. These monks were able to raise their body temperature enough to dry wet blankets in freezing temperatures. Keep in mind, that this defies the Western conception of physiology (people aren't supposed to be able to raise their core temperatures like this without passing out, or dying).
So part of the reason why we might not know much about this 'stuff' is simply because it does not fit into our current conceptions of physiology/anatomy, and therefore remains difficult to 'prove,' until the conception changes.
I'd also suggest looking into the current revolution going on in cognitive therapy, in which ancient Buddhist mindfulness practices are being used to treat major psycological issues--then I'd like to hear you say again that these people had "virtually total ignorance about physiology and anatomy".
"Seek not to follow in the footsteps of the men of old; seek what they sought."