So why so much chest, back, and arms work? Ironically, showcasing your newfound six-pack won't be just about the abs. By building up your entire upper body, you’ll create more shape that will help define the midsection. Your volume of muscle building will also increase your metabolic rate, helping you burn more calories in the process. Remember, it’s all connected. You'll thrash your abs three days a week along with some interval cardio activity for 30 minutes, and bang out some other muscle groups or hit a second helping of arms with whatever time you have left. Your other three days per week will be dedicated to chest, back, and arms exercises, so that your upper-body mass grows—increasing the V-angle and minimizing the chance of having a belly.
Natural trainers can build up to 20 pounds of muscle in their first year of strength training. Muscle growth slows down with each year of training until it creeps to a crawl in the 4th year. A natural trainer in his 4th year of strength training will build a pittance of 2-3 pounds of muscle in the entire year and that’s when his diet and training are both on point.
A University of Southern Maine study found that a single set of a weight-training exercise torches as many calories as running at a 6-minute-mile pace for the same amount of time. So for every second you spend lifting weights, your body is expending high amounts of energy. Add high intensity interval training (HIIT) principles to your workout, and you could see even more gains.
Some experts recommend eating six small meals a day, instead of the more conventional three, cutting out added sugars and processed foods, and loading up on dependable sources of protein to help build new muscle in your midsection. Before you commit to any new diet, though, speak to your doctor and/or a nutritionist to see what they believe will work best for you.
To do it: Stand with your feet planted 3-4 feet apart, toes slightly turned out, hands on your hips. Lower into a plie by bending your knees out over your toes and lowering your hips directly underneath your shoulders. Then, as your straighten back up, slowly lift the right knee up towards the right shoulder. As you go back into the plie, slowly return the foot to the floor. Be sure to move at a very controlled pace to really engage the obliques the entire time—on the way up and on the way down. Do 10 repetitions on the right side, then another 10 repetitions on the left side for a total of 20. 

best ways to build core

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