So let's get to it. Here are the experts' choices on the most effective abdominal exercises. These should be performed two to three times weekly (for beginners, two is plenty to start). Each exercise should be executed until the point of momentary muscular failure, which should happen between 30 and 90 seconds. This is considered one set, which should be no more than 15 to 20 repetitions. Rest for 30 to 60 seconds. Concentrate on performing each exercise slowly with good form. Work up to completing two to three sets of each exercise.
Good news: Thanks to some of the best trainers in the country, we’re going to help you out. Below are their favorite abs exercises, along with a few pro tips to ensure that you’re executing each one perfectly. Incorporate them à la carte into your existing routine—or, if you’re feeling ambitious, turn all six into an abs workout circuit. Try two sets of each movement, resting for 30 seconds between each set.
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.
The Single Leg Bridge Exercise is a good way to wrap up your core workout in order to keep your core strong and balanced. The single leg bridge is a bit more challenging than the basic bridge exercise. It targets and strengthen the gluteus maximus and hamstrings, but done properly, it is also a terrific core strengthening exercise that targets the posterior chain and the back of the body.
Bodyweight training builds an excellent muscular foundation. After I built my six pack abs with bodyweight training, I wanted to build more muscle so I started lifting weights. 4 months after I started weightlifting, I  was deadlifting 460 pounds, bench pressing 275 pounds, squatting 365 pounds and military pressing 175 pounds. I owe this incredibly fast progress to the foundation I built with bodyweight training. (If you don’t believe me, read Arnold Schwarzenegger’s biography that documents his bodybuilding career (which I reviewed here) and you’ll see that he also recommends newbies to start building muscle with bodyweight training.)
Do it: With your feet shoulder-width apart, lift a barbell off the rig, centering it evenly across your shoulders. (This version of the squat targets the core, not the legs, and so you should be using far less weight than you would for a traditional back squat.) Send your glutes back like you’re lowering into a chair, bending at the knees as deeply as possible. Press through your heels to return to the starting position for one rep. Do 12 reps for one set.

Eat carbs. "There's this notion that carbs are bad and that you need crazy amounts of protein to be lean and fit," says Alcantara, who disagrees, and eats just as much carbs as protein, although the ideal ratio varies based on your goals. "Whatever you eat to get the results you want has to be sustainable, otherwise you're going to end up right back where you started with the same habits that got you there."

ripped 6 pack abs