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Photo: Microgen (Shutterstock) The 12-3-30 workout has taken over TikTok, which is a testament to the algorithm and a few influencers’ abilities to game it. It’s really just treadmill walking, with specific parameters and overblown promises. So let’s break down the pros, cons, and caveats—and make a plan for how to do a similar workout that makes sense for you . What is the 12-3-30 workout? It’s walking on a treadmill with the incline maxed out. In other words, you’ll be walking uphill. You set the incline to 12% (the highest you can go on many treadmills), the speed to 3.0 miles per hour (a pretty typical walking speed for most of us on flat ground) and you do it for 30 minutes. Its popularizer, Lauren Giraldo , has said she does it five times a week. She has also said it’s the main thing she does in the gym, with other exercises thrown in less consistently, and she has shared before-and-after photos of other women who credit the workout with helping them lose weight. Is the 12-3-30 workout good for weight loss? Trick question! No individual workout is going to be responsible for weight loss. You lose weight by eating slightly less than you burn , measured as an average over time. Exercise can help you burn more calories, but your body often compensates by burning fewer calories when you’re at rest , so you can’t just trust a treadmill walk to burn a certain number of calories […]