Unless you are on steroids, training 4 times a week is the sweet spot for building muscle. You’ll need resting days for your muscles to grow. One day of training followed by one day of rest is the ideal set up for muscle growth but since there are 7 days in a week, you can train either for 4 days or 3 days a week. Training for 3 days a week is too lazy for a lofty goal like getting six pack abs so it’s best to train 4 days a week and arrange your consecutive days of training to target different muscle groups in your body. Sure, some muscle groups will inevitably be trained for 2 days in a row but that’s a minor issue when you consider that you have 3 whole days of resting in a single week.
Do it: Stand with your feet hip-width apart and hold a dumbbell in your right hand, palm facing inwards towards the torso. Keep your back straight, activate your core, and then bend to the side as far as possible—but only at the waist. Hold for one second at the bottom of your range of motion, and return to start for one rep. Do between 12 and 20 reps for one set.
Elevate your lower body on a low box (preferably padded to protect your knees). This imparts better leverage to your arms and shoulders, an advantage that is especially important for women (usually women are proportionally weaker in the upper body than men). The correct start position is with your shoulders directly over the wheel and your abs pulled in and head down. Keep your shoulders in front of the wheel as long as possible. Inhale while rolling the wheel forward and exhale as you return to the start position. Arching your low back is wrong! This error occurs when the wheel is extended too far for your abdominal strength and performing the exercise like this can cause back injury and pain. You will be able to extend further out, as you get stronger – in fact; I have seen several athletes do this from a standing position!
Refresh your abs workout with these 25 core exercises. They'll challenge your abs from all angles, making you stronger in everything you do and giving you a body you'll be proud to show off shirtless. And for a complete fitness program that will not only build your abs muscles, but also melt the fat that covers them, try Anarchy Abs from Men's Health. You’ll get five 30-minute calorie-torching workouts that employ a unique blend of metabolic training, traditional strength training, and gymnastics fundamentals to strip away fat from head to toe.