How to: Lie on your left side with your legs straight and your right leg stacked on your left. Position yourself so your weight is resting on your left forearm and the outside edge of your left foot. Your elbow should be directly beneath your shoulder, and your upper arm should be perpendicular to the floor. Align your body so it forms a straight line from your neck to your ankles, and place your right hand in the air. Engage your core, and slowly twist your chest left, until it’s parallel to the ground. As you do this, thread your right arm through the space between your body and the floor. Raise back to start. That’s one rep. Do 15 reps on each side.

When guys talk about six-packs, they are really talking about one muscle, called the rectus abdominis. “The rectus abdominis runs from our lower ribs down to the top of our pubic bone, and fibrous bands of tissue break up the muscle along the way to give us the six-pack look we all desire,” explains kinesiologist David Cary, C.P.T., a T4 Coach at Equinox in Chicago. So, if you want to sprout six-pack abs, this is the muscle you need to work.

"This exercise is so effective because it teaches you not to rely on your bigger muscle groups (like your thighs) and focuses on using your abdominals correctly in a controlled manner without using momentum. The use of the ball gives you natural feedback of your weaker side so that you can adjust and work on symmetry of your musculature, preventing future injuries."

That's because it’s insanely hard to get ripped abs. “Every woman’s body is built differently, so it varies, but generally speaking it takes a lot of time and dedication to get those abs to show,” says Amanda Butler, C.P.T., instructor at The Fhitting Room in New York City (and a fitness model who has her own fierce six-pack). “It can take anywhere from three months to a year to get a six-pack, and it’s not just about doing a ton of abs exercises.”
One of the best tricks for getting six-pack abs is to lose some weight, even if it’s just a few pounds. And one of the best ways to lose weight is to adhere to the 80-20 method. Since it takes your brain about 20 minutes to “catch up” to your stomach and realize that, hey, you’re full, oftentimes, you’ll eat more than you need to. So eat 80 percent of what you’d normally eat, then wait 20 minutes. If you’re still hungry, eat the remaining 20 percent of your portion. But chances are, you won’t be hungry one bit. And for more great ways to lose weight, master the 20 Techniques Successful Dieters Share.
Do it: Think of this as an upside-down dead bug. Start in a tabletop position, with your shoulders over wrists and hips over knees. Engage your core while simultaneously lifting your right arm and left leg. Your foot should be flexed as you kick back, and your palm should face in towards your body. Pause for one second when your arm and leg are at the same height as your torso, and then bring your elbow and knee to touch underneath the body. Repeat on the other side for one rep, and do five reps for one set.
How to use this list: Clayton suggests doing each exercise below for 30 to 45 seconds before every run. “This will fire up your muscles so they’re active when you need them most,” Clayton says. Clayton even demonstrates them herself, so you can nail the perfect form. You will need a mat and a set of sliders. Two hand towels or paper plates will work. too.

Better news: By doing the types of routines here that strengthen from all angles and focus on function (how your body moves in real life) rather than flexion (crunches), you’ll look good and have a stronger core and less risk of lower back injury. “Not only will you see better gains faster, it’s also the quickest way to take inches off your waistline,” says Fitzgerald.
A common belief in bodybuilding is that a beginner can make progress lifting rocks. This is not to offend the brutally huge strongmen you see on the MET-Rx World’s Strongest Men on ESPN who lift those 350-lb. Atlas Stones but is to emphasize the point that beginners can make progress on just about any program, using just about anything for resistance, even small Flinstone pebbles. But just because beginners can have success with minimal effort and nonspecific workouts, this doesn’t mean that their training protocol will also work for an experienced athlete, or for someone who wants to go even beyond a “slightly visible” 6-Pack!
Why it made the list: Those infomercials got one thing right! Some EMG data suggests that using an ab wheel may beat out hanging leg raises, sit-ups, and reverse crunches for the top muscle activator. This movement capitalizes on the concept of anti-extension perfectly; as you roll out, your trunk must actively fire (eccentric motion) to maintain a neutral spine without collapsing under your body weight and gravity.[2] Watch that you don't risk your back by allowing it to droop into extension at the bottom, though!
Do it: Lay face up on the floor with arms straight above your shoulders. To start, bring your knees directly over your hips and bend at the knee so that your calf forms a 90-degree angle with your thigh. Next, simultaneously lower your left arm above your head while straightening your right leg and sending it towards the floor. Pause, return to the starting position, and then repeat on the opposite side. Do 14 alternating reps to complete one set.

Alcohol also hurts you in two other areas: “It is a diuretic, which dehydrates you and reduces energy levels,” he says. “It also can decrease testosterone in our bodies which is critical for creating muscle.” Next time you’re planning guys’ night, stick to one or two light beers or a hard liquor with a diet soda mixer. After that, opt for club soda with a lime—nobody but the bartender will know.

The inspiration for this exercise might come from skiing, but it's also an effective way to prepare your midsection for many sports, including tennis, softball, and golf. The reason: "It trains your abs, lower back, and hips to work together to rotate your body from side to side," says Durkin. And the more powerfully you can rotate, the faster you can swing and the harder you can throw.
Trainer tip: You know planks, right? It’s easy to go through the motions here. Don’t do it. “The key is to squeeze your entire body—quads, glutes, core, back, and fists—as tight as possible while taking diaphoretic breathes throughout the hold,” says Wealth. No matter how many times you’ve done it, this exercise is as difficult as you’re willing to make it.
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.
Do it: Lay face up on the floor with arms straight above your shoulders. To start, bring your knees directly over your hips and bend at the knee so that your calf forms a 90-degree angle with your thigh. Next, simultaneously lower your left arm above your head while straightening your right leg and sending it towards the floor. Pause, return to the starting position, and then repeat on the opposite side. Do 14 alternating reps to complete one set. 

Here’s a how a standard HIIT routine goes: one minute of strenuous exercise followed by 30 seconds of rest, repeated four to six times. You can do it for anything: sprinting followed by walking; biking full-steam followed by a casual pace; butterfly strokes followed by a doggy paddle. Or, if you really want to turn up the heat on HIIT, try out The Single Best HIIT Workout For Turning Back the Clock.
My Cardio and Callisthenics circuits really helped me increase my stamina and perform like an athlete. Some of my favourite ones are Burpees, Crab Walk, Jumping Jacks, Jumping Squats, Kettle bell runs and in general, circuits variations that really push me to the limit. I followed an HIIT program on the treadmill where I would run for 2 minutes and walk for 1 for a total of 12 minutes. I used the preprogrammed interval training option on the elliptical and stepper machine. I also went to the park sometimes for my workouts. You’ll be surprised at how different and relatively harder it is to train in the open.

Why it made the list: This increasingly popular movement trains your abs to do what they're supposed to do: stabilize your skeleton. Pallof presses serve as an anti-rotation movement, meaning the body is actively fighting rotation throughout the motion. By utilizing exercises like this, you can increase core stability in various planes of movement and reduce likelihood of injury.
How to: Lie faceup on floor with arms and legs in the air, knees bent 90 degrees. Maintaining contact between low back and floor, brace core, then slowly and simultaneously lower right leg until heel nearly touches floor and left arm until hand nearly touches floor overhead. Pause, then return to start and repeat on the opposite side. That’s one rep. Do 15 reps.
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.
But there's science behind this buzzkill. The rectus abdominis — the muscle that makes the stomach look defined as hell — is typically covered by fat (because that's how humans are made) and isn't affected by things like crunches and planks. "You can work your abs all you want, but if you have a layer of fat over them, the 'pack' can’t be seen," Ball says. And FWIW, that's not a bad thing or something to feel bad about. "It’s very unrealistic for most people to have body fat percentages low enough to see the abs."