From the 12-3-30 workout to the the 75 Hard Challenge , there’s no shortage of fitness methods with quippy numbers-focused names. One that’s been making the social media rounds in recent months is known as the “4-2-3k method.” And while it sadly doesn’t involve winning $3,000 or some gold jewelry, this health trend does promise to help people get more consistent with their fitness. Below, experts break down what the 4-2-3k workout method entails, the benefits and downsides of this approach to