Get a flat stomach without resorting to boring sit-ups with this ab workout. And get firmer arms, butt, and thighs while you’re at it too!

Pike and Extend

Targets: Abs, legs

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a. Lie faceup on mat with legs extended over hips, arms overhead. Crunch up, reaching hands toward feet.
b. Keeping legs straight, bring arms back overhead as you lower upper back and left leg toward floor.
Crunch up, lifting left leg over hips and reaching hands to toes. Switch legs; repeat. Do 20 reps, alternating sides.

Standing Side Crunch

Targets: Obliques, legs

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1. Stand with your knees slightly bent, your feet hip-width apart and your hands behind your head.
2. Shift your weight to the left leg, crunch to the right side and bring your right knee up toward your elbow.
3. Lower your right leg and return to the starting position.
4. Switch legs and repeat until set is complete.

Keep your spine and neck neutral, your chest up and your core engaged. Breathe out as you crunch and try not to bend your spine forward or swing your hips back and forth.

Adding standing side crunches to your workout routine helps to target the oblique muscles and tightens the entire side ab wall more effectively. It also improves your balance, increases strength and stability, and burns more calories than side crunches done on a mat.

Chest Flye with Leg Extension

Targets: Chest, abs

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Lie faceup on mat, knees bent 90 degrees over hips, holding a dumbbell in each hand, arms extended over chest, palms in.
Keeping right knee bent, straighten left leg toward floor as you lower arms out to sides. Hold for 1 count, then return to start.
Do 10 reps. Switch legs; repeat.

Knee-Up with Overhead Press

Targets: Shoulders, abs, glutes

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Sit on mat with knees bent and feet on floor, holding dumbbells near shoulders, elbows by sides, palms in.
Lean back slightly and extend arms overhead as you lift feet a few inches off floor and bring knees toward chest.
Hold position for 1 to 3 counts; return to start. Do 15 reps.

Lunge and Twist

Targets: Abs, glutes, legs

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This lunge variation works the entire body, and adding the twist ensures that your abs get a little extra attention.

Stand with your feet hip-distance apart. Hold a five- to 10-pound medicine ball with both hands with your arms outstretched in front of you.
Keep your core stable, and take a large step back with your right foot, planting your foot and then lowering your body until both legs are bent in right angles.
As you sink into the lunge, twist your torso to the left.
Bring your torso back to center, and exhale as you straighten your legs. Bring your feet back together, and then step back on your left leg, twisting to the right.
This completes one rep. Do 10 reps for a set, and do at least two sets.