Since there's no such thing as spot reduction, simply planking like your life depends on it won't help you lose belly fat. Combining cardio and strength work in the form of high-intensity interval training, however, will, says Elyse Miller, the certified personal trainer who created these routines. (Miller is all about quick, no-equipment fitness—aka our kind of trainer.) Research shows that when your exercise sessions include bursts of all-out work, you lose more belly fat (in addition to all-over body fat) than if you'd worked at a lower but steadier intensity. And did we mention that these workouts take about 10 minutes each? You're welcome, time-crunched women of the world!

Doing HIIT every single day isn't recommended (your muscles need some R&R so they can properly rebuild, and doing intense exercise every day can increase your risk of overuse injuries), so Miller suggests capping your HIIT sessions at four per week, plus two steady-state cardio sessions and a rest day.

Here's your schedule:

Monday/Day 1: Workout 1
Tuesday/Day 2: Workout 2
Wednesday/Day 3: 20- to 30-minute jog, or speed-walk
Thursday/Day 4: Workout 3
Friday/Day 5: Workout 5
Saturday/Day 6: 20- to 30-minute jog, or speed-walk
Sunday/Day 7: Rest!

For the Workouts
Do each exercise for 20 to 30 seconds, rest for 10 seconds then move on to the next exercise. (When you're doing a single-leg, or single-side, move, do 20 to 30 seconds on each side before moving on to the next exercise.) Repeat the entire circuit two times. You can bump up the intensity by moving faster, while still maintaining good form, of course.

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