During the last part of a concentration exercise (focusing eyes on a point between eyebrows) I felt a need to contract my Pubococcygeus muscle. During contraction I was feeling some vibration in my left wrist. What was that? It was nice vibration while my mind was clear.

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DISCLAIMER: It isn't that such phenomenons don't occur during Buddhist meditation, but typically such bodily phenomenons are not emphasized in most Buddhist traditions, and thus Buddhists lack the vocabulary. Tibetan Tantra practice is an exception, but that's because it derives a lot of its vocabulary and practices from tantric yoga. The subtle body is viewed in Buddhism as personified impermanence.

From your description it appears to be a spontaneous Mula Bhandha. Like sneezing or coughing, spontaneous yogic postures are natural bodily occurrences, and are nothing to be wary of. They are triggered by conditions. For example, we sneeze in response to being in a room full of dust, similarly, when there are certain subtle energy manifestations in the body that are in need of correction, the body makes use of such locks or yoga mudras.

Bandhas Image source: http://sequencewiz.org/2014/09/10/mula-bandha/

Without knowing more details about the quality and nature of vibration you felt, it would be hard to say for sure, but it sounds like Piti / Sukha. The clear mind you mention is likely the mind born of seclusion.

You can read more about Jhana factors by searching the web, but here's a helpful summary. Also see a similar question on this site.

I'd recommend gaining reasonable perfection in either Hatha Yoga meditation, or in Buddhist meditation. Unless you have strong reasons for doing so, dabbling with both at the same time can be unproductive.

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    Thank you for answering. Should we also close the question as being off-topic i.e. unrelated to Buddhism?
    – ChrisW
    Sep 18, 2015 at 8:29
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    I'm not sure, since this is partly about piti / sukha. In any case, I've experienced such bhandhas during vipassana and struggled to find Buddhist texts that explain them.
    – Buddho
    Sep 18, 2015 at 8:34
  • FWIW, Buddhism lacking a vocabulary for this sort of thing has not stopped us from discussing it in the past. For example, there's 1 question and 9 answers that mention "kundalini" on this site - buddhism.stackexchange.com/search?q=kundalini
    – Buddho
    Sep 18, 2015 at 20:00
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    @Buddho, thank you, question is clear and correct enough for me. Sep 18, 2015 at 20:50
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    @ChrisW, I vote it is definitely related to Buddhism. Probably most long-time practitioners of meditation have experienced things like this.
    – Adamokkha
    Sep 18, 2015 at 23:44

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