I have believed for quite some time that slapping limbs is "good for blood circulation", without ever looking more into it. After getting curious about it, I found a lot of claims that it's good for many things, from emotional well-being to face skin tone, but no good evidence for it.
The closest I've found to a good source is this rowing article:
A couple theories did emerge from those discussions, along the lines of the following:
- believed to slow lactic acid build up (which does not seem to be based in science)
- increases blood flow/keeps muscles loose (which does)
- a habit that could be derived from the above
When looking on pubmed, I was unable to find anything related using "slap" and "tap" as keywords.
Does slapping parts of your body increase blood flow in a way that helps with physical activity?