If you follow wellness channels on social media, you might've come across the claim that your grip strength – or how firmly you can squeeze something with your hands – can predict how long you will live. This sounds far-fetched. Yet the science supports such a connection. But as wellness influencers try to monetize this link, what started as something based on scientific evidence starts to get stretched. Now some influencers claim just strengthening your grip strength can help you live longer.