The 12-3-30 workout is a walking incline treadmill workout created by social media personality Lauren Giraldo. It involves setting a treadmill to a 12% incline and walking at 3 miles per hour for 30 minutes. The workout is designed to offer the benefits of weight loss, endurance, and strength-building, and it is approachable for people with a range of fitness levels. The 12-3-30 workout is a great plan for anyone who wants to start walking for weight loss or try walking as a workout. It is also good for anyone who is new to fitness and looking to increase the amount of cardiovascular exercise they do without turning to an activity like running, which can be tough to do from scratch for some people. The workout has gained popularity on social media, especially TikTok, where the hashtag #12330workout has 313.2 million views.