A hugely popular and simple exercise has taken TikTok by storm with millions of gym-goers taking on the challenge.
The so-called #12330challenge now has more than 45million views on the app with gym newbies and experienced fitness folk alike all giving the workout a go.
The trend can be traced back to influencer Lauren Giraldo, who shared the 12-3-30 treadmill on TikTok in November 2020, according to Cosmopolitan.