You already know that walking is great for your arms, legs, butt, and heart, but here's a little-known fact: It's also a great way to flatten your belly. (Learn how to walk away from belly fat, heart disease, and diabetes in just minutes a day with Prevention's brand-new program, Walk Your Way To Better Health!) 

Women who walked briskly for about an hour a day for 14 weeks shrunk their belly fat by 20%—without changing their eating habits, reports a Canadian study.

To firm up even faster, don't do just any old walk. This walking workout teaches you techniques that trim abdominal fat while you move; ab exercises, done during short breaks, will give you added definition. The result targets belly fat: a flatter, stronger middle in just 6 weeks—no sit-ups required.

The Expert Scott Cole, author of the Best Abs on Earth DVD, designed this workout

6 Weeks to Slim

Ultimate Belly-Flattening Workout

Your Workout at a Glance: The three plans below offer cardio intervals of fast-paced Power Walks and moderate-paced Tempo Walks to burn calories and shed fat. During each, you'll do Walk 'n' Tone moves (page 3) to work your abs harder and Stop 'n' Tone (page 4) exercises to really sculpt.

Do each full routine 3 times a week. On alternate days, take the walks but skip the toning moves.

Pace Yourself Based on a 1-to-10 intensity scale:

 Warm-up & Cool-down (3-4 intensity level) Easy enough that you can sing

 Tempo Walk (5-6 level) Moderate enough that you can talk freely

 Power Walk (7-8 level) More difficult to talk

Click here to get started 

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Weeks 1 & 2: Firm up fast
The basics: As you walk, engage your abs by lifting the crown of your head and lengthening your spine.

Start: Warm-up, easy pace (3-4 intensity level)

4:00: Power Walk, brisk pace (7-8 intensity level) with arms bent

5:00: Tempo Walk, moderate pace (5-6 intensity level)

7:00: Power Walk 

8:00: Stop 'n' Tone—Side Pull-down

8:30: Power Walk

9:30: Tempo Walk

11:30: Add Walk 'n' Tone—Curl

12:30: Stop 'n' Tone—Cross Punch

13:00: Power Walk

14:00: Tempo Walk

16:00: Add Walk 'n' Tone—Reach

17:00: Stop 'n' Tone—Knee Twist

17:30: Power Walk

18:30: Tempo Walk

20:30: Add Walk 'n' Tone—Press

21:30: Stop 'n' Tone—Lunge Run

22:00: Power Walk

23:00: Tempo Walk

25:00: Power Walk

26:00: Stop 'n' Tone--Slip a Punch

26:30: Power Walk

27:30: Tempo Walk

29:30: Power Walk

30:30: Stop 'n' Tone—Standing Crunch

31:00: Cool-down, easy pace

35:00: Finished!

Weeks 3 & 4: Burn off fat
What's new: Tempo Walks are longer to burn extra calories and uncover the flat abs that you've been working on.

Start: Warm-up, easy pace (3-4 intensity level)

4:00: Power Walk, brisk pace (7-8 intensity level) with arms bent

5:00: Tempo Walk, moderate pace (5-6 intensity level)

9:00: Power Walk 

10:00: Stop 'n' Tone—Side Pull-down

10:30: Power Walk

11:30: Tempo Walk

15:30: Add Walk 'n' Tone—Curl

16:30: Stop 'n' Tone—Cross Punch

17:00: Power Walk

18:00: Tempo Walk

22:00: Add Walk 'n' Tone—Reach

23:00: Stop 'n' Tone—Knee Twist

23:30: Power Walk

24:30: Tempo Walk

28:30: Add Walk 'n' Tone—Press

29:30: Stop 'n' Tone—Lunge Run

30:00: Power Walk

31:00: Tempo Walk

35:00: Power Walk

36:00: Stop 'n' Tone—Slip a Punch

36:30: Power Walk

37:30: Tempo Walk 

41:30: Power Walk

42:30: Stop 'n' Tone—Standing Crunch

43:00: Cool-down, easy pace

47:00: Finished!

Weeks 5 & 6: Boost benefits
What's new: Stop 'n' Tone moves are longer (60 seconds each) to really tighten and firm your midsection.

Start: Warm-up, easy pace (3-4 intensity level)

4:00: Power Walk, brisk pace (7-8 intensity level) with arms bent

5:00: Tempo Walk, moderate pace (5-6 intensity level)

9:00: Power Walk

10:00: Stop 'n' Tone—Side Pull-down

11:00: Power Walk

12:00: Tempo Walk

16:00: Add Walk 'n' Tone—Curl

17:00: Stop 'n' Tone—Cross Punch

18:00: Power Walk

19:00: Tempo Walk

23:00: Add Walk 'n' Tone—Reach

24:00: Stop 'n' Tone—Knee Twist

25:00: Power Walk

26:00: Tempo Walk

30:00: Add Walk 'n' Tone—Press

31:00: Stop 'n' Tone—Lunge Run

32:00: Power Walk

33:00: Tempo Walk

37:00: Power Walk

38:00: Stop 'n' Tone—Slip a Punch

39:00: Power Walk

40:00: Tempo Walk

44:00: Power Walk

45:00: Stop 'n' Tone—Standing Crunch

46:00: Cool-down, easy pace

50:00: Finished

Walk 'n' Tone Moves

Add these simple arm exercises to your walk to boost its tummy-firming power. "Moving your upper and lower body at the same time makes your torso muscles work harder to provide stabilization and balance," says Cole. The result: "You'll shape up faster." 

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Curl: With arms out to sides at shoulder level, bend elbows, pulling hands toward shoulders like you're doing bicep curls.

Reach: Raise arms out in front of you at shoulder level like you're punching. Alternate arms in opposition to legs.

Press: Alternate reaching arms overhead.

Stop 'n' Tone: Ab Exercises

Do each move for 30 seconds. If it works only one arm or leg, do 15 seconds on each side. Double the time in weeks 5 & 6.

Side Pull-down

Targets the obliques on your sides for a more defined waistline. 

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Stand with feet shoulder-width apart, arms extended overhead. Shift weight to right foot and contract left side of torso, lifting left knee out to side. At the same time, bend left arm and pull elbow to left thigh. Extend arm and leg back to start, but tap toe on ground and repeat. Switch sides.

Cross Punch

Targets the transverse abdominal muscle to firm your lower abs.

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Stand with feet shoulder-width apart, knees slightly bent, and abs pulled in. Bend arms so fists are at about chin level, like a boxer. Keeping feet planted, twist to right and punch with left arm, then return to start. Contract lower abs with each punch. Repeat, alternating arms.

Knee Twist

This twisting move targets the obliques to slim your waistline.

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 Squat with hips and knees bent, feet shoulder-width apart, and hands behind head. As you stand up, raise left knee as you twist to left and pull right elbow toward left knee. Lower and repeat with right leg.

Lunge Run

Tones your rectus abdominis, the long muscle that runs from your ribs to your pelvis, to define your abs.

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Lunge with left foot in front and right foot about 2 feet behind it, arms bent at sides. Keeping left knee bent and torso still, lift right knee toward chest and lower, swinging arms back and forth. Switch legs and repeat.

Slip a punch

Targets the oblique muscles to shrink stubborn love handles.

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Stand with feet shoulder-width apart, knees bent slightly. Bend arms so fists are at about chin level, like a boxer. Keeping shoulders relaxed and lower body still, bend at waist and lean torso to right as if you were trying to avoid a punch. Repeat, bending to left.

Standing crunch

Like on-the-floor crunches, this move tones the rectus, the muscle group responsible for the six-pack look. 

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Lunge with right foot in front and left foot about 2 feet behind it, arms overhead. As you straighten right leg, raise left knee toward chest as you bend and pull elbows down toward left knee. Return to start. Switch legs and repeat.

More from Prevention: 14 Reader-Tested Walking Routines

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Michele Bender
Michele Bender also writes for Self and Fitness and lives in New York.