(Source: Ahrefs)

The Signal: Over the second half of 2019, a popular massage gun brand (www.theragun.com) saw a marked increase in the number of referring domains. The product is shaped like a futuristic laser blaster and is not cheap ($600). But its oscillating motion helps improve blood circulation and speed up workout recovery.

The Opportunity: The product had a viral moment in 2017, when then-Cleveland Cavs superstar Kyrie Irving received a Theragun treatment during the NBA Finals. In 2018, it was endorsed by the controversial NFL player Antonio Brown.