Gua sha looks good on Instagram – but is it worth the hype or a waste of time?

<p>The practice does increase blood flow to parts of the body, but experts say this isn’t necessarily a health benefit: ‘A punch to the nose also increases blood flow’</p><ul><li><p>Read more in the <a href="https://www.theguardian.com/commentisfree/series/antiviral"