Orange Justice, the Nae Nae and flossing have all had their chance in the social media sun, but there's a new dance trend on the block: the Triangle. As the name suggests, the dance involves three people standing in a triangle formulation, with their hands on each other's shoulders. What ensues can best be described as: jump forward, sidestep left, sidestep right, repeat - until you're exhausted or crash into each other. That last bit happens quite a bit as it turns out, with some wry observers noting that the dance may well be aimed at taunting those with two left feet or poor co-ordination skills. The Triangle dance is sometimes known as the Milkshake Challenge - owing to TikTok user Matthew Jones's February video of him and two friends dancing to <em>Milkshake </em>by Kelis. This spurred a bunch of others to attempt the three simple-looking but highly co-ordinated steps to the same song. The Triangle has since been attempted and posted by everyone from kids in a fourth-grade classroom and teens in a high-school gym to a team of doctors and newsreaders on office premises - some slick, but most ending in collision and much laughter. The #TriangleDance and #TriangleDanceChallenge #TriangleDancers hashtags on Instagram have about 1,000 posts as of now, with the number predicted to grow to many more times that. A song with clear beats is best, but not necessary. As these gentlemen at Leicester Square discovered, it works perfectly well on <em>Gangnam Style</em>, too. Bruised knees, toes and egos aside, the Triangle is a great way to warm-up before a group exercise session. Just remember to partner with people you trust.