Hiit treadmill

Get your heart rate up and burn calories with these effective HIIT treadmill workouts. Boost your fitness level and achieve your goals with high-intensity interval training on the treadmill.
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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