Reiki

Reiki is a Japanese form of alternative medicine called energy healing. Reiki practitioners use a technique called palm healing or hands-on healing through which a "universal energy" is said to be transferred through the palms of the practitioner to the patient in order to encourage emotional or physical healing.

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Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 año ago

These types of exercise are allowed as far as it does include any non Islamic religious thoughts, claims or acts. 

Wassalam.

Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 1 año ago

There isn't a lot of scholarly discussion about Reiki (although there is somewhat more discussion in Iran). On this topic, the following answer has been presented from Ayatollah Khamene'i:
 

Question: Is there any problem with Reiki or energy healing?

Answer: If it is done for a rationally acceptable purpose, and does not cause harm, and is not associated with corruption or sin [presumably, like harmful cults, using it as an excuse for inappropriate touching, etc], in and of itself, there is no problem.

https://hadana.ir/%D8%AD%DA%A9%D9%85-%D8%A7%D9%86%D8%B1%DA%98%DB%8C-%D8%...

Tai chi - I don't have any specific references to fatwas on tai chi (perhaps someone else can post one). Presumably it would fall under the category of martial arts (since Eastern martial arts tend to be based in a worldview involving some element of chi, not just the mechanics of physical fighting) which tend to be allowed, unless there is any specific practice which conflicts with one's religious worldview that one should abstain from. (For instance, some Muslims may avoid bowing or prostration during martial arts training, even if they are cultural norms in some places.)

But, in general, these sorts of things tend to be theologically neutral since they are, essentially, practices. Even if they have some sort of underlying cosmological worldview that they are situated in, which comes from their cultures of origin, one can usually choose to accept or reject parts of the underlying worldview, since they are not usually required for the practice.

For instance, one cosmological worldview that is often mentioned during Reiki training is the idea that all human beings are interlinked and just have the illusion of separation (hence, we should be inclined to heal each other and be good to each other, rather than being selfish, egotistical, or self-serving). While this could be concordant with the Qur'an (since the Qur'an mentions that all human beings were created and will be resurrected as a single soul), some Muslims might not agree with that view and prefer to see people as entirely separate. However, accepting or rejecting the explanatory worldview is not necessary to carry out the actual practice, which is a procedure.

So, one can use one's own beliefs to decide what aspects of a practice to do or not do, or what ideas to accept or not accept, whether it be Tai Chi, Reiki, working in the media, attending university, socializing, or anything else we do in life where we have to make good decisions, and are sometimes in an environment where people have different cultures, beliefs, or worldviews.

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Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 2 años ago

According to some scholars in Iran, reiki is permissible.

In order to do reiki properly according to conventional methods, one does not recite anything except for a few words (which are optional and related to the technique), so reciting Qur'an here is not a factor. If one is relying on recitation of Qur'an or something else as the primary method, it is no longer reiki.

Of course there is no harm in reciting Qur'an or playing it in the background, and there is no harm in reciting Qur'an in the hope of or with the intent of healing.