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Flat-Belly Challenge Day 1

Fat-Blasting Intervals and a Slimming Smoothie Kickoff Our Flat-Belly Challenge

Flat-Belly Challenge Day 1

Ready, reset, go: our Flat-Belly Challenge has 21 days of belly-blasting workouts, tips, and recipes to help you start a fresh note. Today, day one is all about belly-fat-fighting intervals and a debloating smoothie made with pineapple, kale, and blueberries.

Fire-It-Up Interval Workout

Let's begin with the fat-blasting workout. We've created three versions of this treadmill run, along with a printable version of all three levels. If you're new to running, try the Walk/Run plan farther down the page. And if you want to increase the speed, use the Run Faster program.

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