Hiit running workout treadmills

Take your running workouts to the next level with HIIT training on treadmills. Discover the best HIIT routines to burn calories, improve endurance, and boost your fitness level.
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TikTok is talking about influencer Lauren Giraldo's "12-3-30" treadmill workout, which involves walking at a level-12 incline for 30 minutes at 3 miles per hour. Here's what fitness experts think about the "12-3-30" workout.

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Courtney Johnson