"I have researched this move in my lab, and it is very effective at activating all of the abdominal muscles (the rectus abdominis, internal and external obliques, and the transverse abdominins), and yet the movement is very straightforward and does not require several steps or positions, says Michele Olson, PhD, professor of exercise science at Auburn University Montgomery.
We all want a solid core for different reasons: sports performance, pain prevention, that finish line photo—but strengthening your midsection is particularly important for runners. That’s because your core is the stabilizing center of your body (it keeps you standing, least of all sprinting), and it can make or break your speed goals, prevent (or contribute to!) an injury, and yes, make you feel pretty badass in a sports bra.
This exercise will stretch many of the muscles responsible for posture that are sometimes tight and it strengthens those same muscles if they are weak. You may discover that when you first perform it, one side of your body is significantly stronger or tighter. For instance, a long-time discus thrower who has turned to his left for years, to initiate his throw, may have significantly stronger obliques on his left side.

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.

To do it: Lie on your back with your hands interlaced behind head, knees bent ,and feet hip-width apart on the floor. Inhale and lift your chest towards your knees, bringing your shoulders and head off the floor, maintaining a neutral pelvis (keeping it parallel to the floor). Exhale and rotate to the right side, and then exhale again rotating even further, lifting a little higher. Next, inhale and lift as you return to the center and repeat to the other side. Do 8-10 reps per side.


Demoing the moves below are Crystal Williams, a group fitness instructor and trainer who teaches at residential and commercial gyms across New York City; Amanda Wheeler, a certified strength and conditioning specialist and co-founder of Formation Strength, an online women’s training group that serves the LGBTQ community and allies; Cookie Janee, a background investigator and security forces specialist in the Air Force Reserve; and Rachel Denis, a powerlifter who competes with USA Powerlifting and holds multiple New York state powerlifting records.
This way, you will prevent muscle exhaustion and injuries. There are several exercises for your abdomen that are highly efficient, such as the bicycle, Captain’s chair leg raise, exercise ball crunches, long arm crunches or the well-known crunch with heel push. These particular exercises are especially designed to stimulate your abdominal muscles, and they also involve several other muscle groups.  Vary the exercises and add weights as necessary to make sure you are always pushing yourself.
That's why Jack recommends doing 360 abs to sculpt a washboard stomach and improve core stability all at once. While in a pushup position, you must keep your torso completely still as your legs create sweeping circles in different directions. Doing smaller loops hit your six-pack muscles, while bigger ones hit your entire midsection including your obliques, hips, and lower back.

Lie on your back, arms behind your head, like you’re in a crunch position, with legs raised and bent at a 90-degree angle. Kick your legs back and forth like you’re riding a bike. While you do that, alternatively twist the upper part of your torso in tandem with your legs. For maximum toning, do this for as long as you can take it. Once you master this move, you’ll never forget it—it’s just like riding a bike!
Abdominal muscles consist of three layers. The very deepest layer is the transversus abdominis, which acts as the body's girdle, providing support and stability and plays a critical role in exhalation. Next is the rectus abdominis, which flexes the spine. Closest to the surface are the internal and external obliques, which turn the trunk and provide the body with rotation and lateral movement.
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.

4. Be sure to eat enough protein. As you lower your calorie intake and cut down on processed foods and refined sugar, be sure to get enough protein, Singer says. "Prioritizing protein will help you maintain muscle mass," he says. Lean meats, skinless chicken and turkey, beans and lentils, tofu and soy-based foods, eggs, nuts and low-fat dairy products are good sources of protein. Your body breaks down protein into amino acids, which it uses to build muscle, according to Harvard Health. Research published in 2015 in The American Journal of Clinical Nutrition suggests that for all adults, consuming high-quality protein (from eggs, beef and dairy products, for instance) in combination with physical activity "represents a promising strategy to delay the onset of sarcopenia [a disease characterized by loss of muscle mass and strength]."
Bodyweight exercises always recruit more than one muscle group for each exercise so it is impossible to isolate and work one muscle group specifically by doing one type of exercise. It is however possible to increase the load targeting specific muscle groups with specific exercises so that they respond the most to the challenge. The following chart helps you find the exercise that helps focus more on specific abdominal muscle groups for best results. 
To do it: Stand with your feet hip-width apart and pressed firmly into the floor and hold a medicine ball (or other similar weighted object). Brace your abs in tight (as if preparing for someone to punch your stomach) and use your lower body to start the movement by bending your knees, sitting back into your hips, and reaching the ball down across the outside of your left leg. Stand up, swinging your arms across your body and up to the right while pressing your hips forward. Do 10-12 reps going from left hip to right shoulder, and then repeat on the other side.
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