They also believe tiger penis improvs your sexual chi. Because the Chinese believe something is not exactly an edorsement of its scientific validity.
Considering that there is no such thing as "chi" to begin with, you can't really improve its flow.
Nothing by Mantak Chia is good.
Here is an example from his website:
Biggest bunch of bullshit ever. Stimulating stem cells with vibrating bamboo wires? WTF? Maniupulating dark matter? You can't just go around mixing modern science and fantasy unless you're going to actually promote it as science fiction (which he is not).
Matt Furey cannot hold a candle to the quackery that is Mantak Chia.
Taoism, by the way, has absolutely nothing to do with any of this shit that Chia promotes. It was a purely philosophical movement. For instance, Christianity is influenced to some degree by ancient Greek philosophers (say Plato). But Christianity does not call itself Platonism, because it isn't. Chia's brand of fairy tales bares no resemblence at all to anything attributed to Lao Tzu or Chuang Tzu (both of whom would probably have beaten that douche Chia upside the head with a rock).
In fact, check out his bio to see more examples of his utter bullshit:
Learned Aikido and Kundalini in Hong Kong? Except that that Chinese hate the Japanese and the Japanese hate the Chinese, and so I have a very hard time believing there was an aikido school in Hong Kong in the 50s, much less that they'd take Chinese students, or that Chinese students would take aikido over Pa Kua, Tai Chi, or one of the many other "soft" Chinese styles. Ditto for Kundalini yoga. There are plenty of native Chinese chi kung systems that basically have all the same shit as yoga. He put in the Aikido and Kundalini because they sound cool.
Then he studied with the "White Cloud Hermit". Pai Mei huh? So he became an enlightened Kill Bill assassin in the mountains or something. White Cloud Hermit my ass. The best, of course, is that the hermits teachings couldn't be understood by the silly white man. Nice condescension there asshole.
Cultish stupidity. But yeah, but don't let that stop you from giving his books props here in T-land.