How ‘12-3-30’ treadmill workout can help lose weight and is still big on YouTube, TikTok
Created by an influencer in 2019 to feel less overwhelmed at the gym, the workout has inspired thousands on their own weight-loss journeys

You may have noticed people talking about the viral “12-3-30” workout on social media, or seen the workouts for yourself at the gym – just look for the people walking at a very high incline on the treadmills.
The workout, created by social media influencer Lauren Giraldo, has received a lot of attention for its simplicity and results. It involves walking for 30 minutes on a treadmill at a 3mph (4.8km/h) pace at a 12 per cent incline.
“I’m not a runner, and running on the treadmill was not working for me,” Giraldo told Today magazine.
“I started playing around with the settings, and at the time, my gym’s treadmill had 12 incline as the max. The three miles per hour felt right, like walking, and my grandma had always told me that 30 minutes of exercise a day was all you needed. That’s how the combination started.”
Giraldo first shared the workout on YouTube in 2019, but it continues to grow in popularity on TikTok. The video has amassed more than 1.6 million views on YouTube and more than 13 million views on TikTok.