Flat Belly Challenge Day 1

Flat-Belly Challenge Day 1: Fat-Blasting Intervals and a Slimming Smoothie

Flat-Belly Challenge Day 1: Fat-Blasting Intervals and a Slimming Smoothie

Welcome to our Flat-Belly Challenge: 21 days of workouts, belly-blasting tips, and fat-burning recipe ideas to help you feel slimmer and more confident all Summer. 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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