“The bird dog forces you to keep your core stiff,” says Jack. “Lifting your knees off the ground just a couple of inches—as you do in this exercise—makes it even more challenging to keep your torso still as you switch arms and legs.” That means your hips and lower-back muscles, obliques, rectus abdominis (also known as the six-pack muscles) are working together to keep your spine stable.
Before you launch into the advanced ab workout, you will want to ease into it with some basic core exercises to warm up the abdominal muscles. The Plank is a great way to begin. The plank provides a simple and effective core warm-up because engages all the muscles of the core from your toes up to your head. Holding the plank requires the activation of all the major ab muscles as well as many stabilizer muscles that are often ignored.
1. Consume fewer calories than you're burning every day. Job one when trying to achieve a six-pack is to lose weight, which means expending more calories than you take in on a daily basis, says Dani Singer, a certified fitness nutrition specialist and certified personal trainer in Baltimore. He's the director of Fit2Go Personal Training. To optimize losing fat and not muscle, you need to be in a caloric deficit, eat adequate protein and strength train, he says. "The source of your food will affect health, but will have zero effect on your body composition," Singer says. "It's the total calories and macronutrients [protein, fat and carbs] from your foods that will determine how your body looks."
Common knowledge will tell you that, to get six-pack abs, carbs are verboten. Common knowledge is right—kind of. The key is to avoid the wrong carbs, like French fries, and eat the right carbs, like sweet potatoes. These orange goodies are full of carotenoids, which prevent calories from turning into fat; fiber, which helps you stay sated, and ultimately eat less; and Vitamin C, which’ll give you energy (for working out). And for more ab-shredding foods, check out the 10 Healthy Carbs That Won’t Derail Your Six-Pack.
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.