Flatten Your Abs
Do each of the following exercises for 10 reps or until you reach failure in giant-set fashion. For 15 minutes do all your exercises one after another without resting. Perform each set with strict form and at a medium pace; don't try to do the reps too fast because it's leanth of time you're going for, not a particular number of sets or reps.
boatpose
Boat pose: Sit erect on your bottom, knees bent, feet flat on ground, legs and ankles squeezed together. Place hands behind the back of thighs and lift feet up so calves are parallel to ground. Hold pose for 3-5 full breaths, keep back straight. Maintaining this potition, contract abs, rounding spine to lower torso a few inches back toward ground, still holding back of things. Inhale, straighten spine and sit back up, keep feet raised as you repeat, then lower feet to ground.
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cancan
Cancan: Sit on ground and lean back, placing forearms and hands flat on ground, elbows under shoulders, knees bent, toes barely trouching ground, legs and ankles together. Keeping legs together and maintaing abdominal contraction, inhale and let knees drop down to the right, toward the ground. Exhale and straighten legs on diagonal. Inhale and bend knees; exhale, bring legs back to the center and immediately drop them to the left, then extend on a diagonal. Continue to alternate (1 rep equals both sides).
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crisscross
Crisscross: Lie faceup, knees bent and in line with hips, calves paralel to ground, hands behind head, fingers unclasped, elbows open. Contract abs so back is in contact with ground, and lifet head, neck and shoulder blades off ground. Inhale, then exhale, extending left leg at a 45-degree angle to ground or lower keeping back in full contact with ground; at the same time ratate upper body toward right knee, keeping elbows open, lifting shoulder blades further off ground. Inhale return torso to center, bending left knee back to starting position; keep torso lifted. Exhale and switch extending right leg and rotating to the left. Continue to alternate (1 rep equals both legs).
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dolphin
Dolphin: Kneel with forarms flat on ground, elbows under shoulders, knees under hips, then extend one leg at a time until you're supported on ball of feet, with legs and ankles together. Lower hips until body forms on estraight line from head to heels in forearm plank position. Inhale, then exhale, pressing hips ward ground without touching it. Inhale, lower to forearm plank pose and repeat in sync with the breath. Repeat.
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sidebend
Side bend:
Sit on left hip, both knees bent, left leg tucked under right with right leg slightly extended a few inches to the right.  Place left hand on ground about 6 inches away from the body and in line with left shoulder, finger tuned outward, arm straight, and right arm resting on right knee, palm up. Inhale; press down into left hand and lift hips off ground and directly up, flexing torso to the left so left shoulder aligns over left wrist. Extend legs and straighten arms to a T pose. Exhale; lower to starting position, bend knees. Repeat reps on each side.
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crunch
Standard Crunch: Lie flat on your back with your knees bend and place your hands lightly behind your head. Crunch up by contracting your abs, raising your shoulder blades off the floor. Hold the contraction for a count at the top before lowering.
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Cardio For Your Abs

 
  • Rowing Machine or Row Outdoors In a Canoe or Kayak :20 minutes.
Avoid locking your knees on the extension. Exhale deeply and lean back slightly each time you pull back.
Calories burned: 185

  • Freestyle Swimming: 25 minutes.
Focus on using your obliques to power your body rotation with each strock. Add side, back and butterfly strokes to further challenge muscles and prevent boredom.
Calories burned:270

  • Stationary or Group Indoor Cycling: 45 minutes.
After a gradual warm-up, maintain a vigorous 12 to 14 mph pace and incorporate 2-3 minutes intervals at a higher resistance out of the siddle. It's a great leg toner, but strong abs will help you stay upright in the saddle and avoid shifting all your weight to the handlebars.
Calories burned: 390

All calories are calculated for a 135 pound woman