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How to make friends with the plank exercise for core strength | CNN

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How to make friends with the plank exercise for core strength | CNN

Editor’s note: Before beginning any new exercise program, consult your doctor. Stop immediately if you experience pain.



CNN
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Planks are widely considered by fitness experts to be a fantastic exercise to strengthen the muscles in your core and elsewhere, no matter your age or physical fitness level.

There are numerous versions of the plank, but its basic form involves balancing on your toes and forearms while holding your body off the ground.

A plank may seem daunting, especially if you are not a fitness fanatic. But it can be modified to be more accessible — or much more difficult.

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No one knows for sure who invented the plank, but some credit Joseph Pilates, who created the Pilates exercise regimen in the early 1900s. What is clear, however, is that the plank became the favored core exercise a decade or so ago, eclipsing the crunch and sit-up. The latter two exercises can put strain on your spine and hip flexors, while planks do not.

But there are other reasons for the plank’s popularity besides going easy on your spine and hip flexors. One is that planking strengthens numerous muscles in your body at once, said Dr. Claire Morrow, a physical therapist in San Francisco who works with digital clinic Hinge Health.

“The plank can activate your postural muscles, shoulders, back of the neck, elbows, triceps, hips and quads,” Morrow said. “It is a pretty efficient exercise in terms of the muscle groups activated while doing it.”

Planks are also great at improving your functional fitness, said Julie Logue, director of programming operations for SilverSneakers, a fitness program for adults 65 years and older that’s included with many Medicare Advantage plans.

“If you do planks regularly, they will improve your posture and help you do everyday activities more easily,” Logue said. “They also have a lot of value because they’re body weight based, so you can plank anytime, anywhere.”

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Finally, planks can help with a wide variety of issues outside of strength, posture and balance. For example, they have been found to help combat urinary incontinence, according to a December 2021 study published in the journal Healthcare. Your golf swing can also benefit from planking, concluded another study published in the June issue of The Journal of Strength and Conditioning Research.

Plank newbies should begin in a standing position, placing their hands on a wall or the edge of a countertop, Morrow said. Walk your feet backward until you’re leaning into the surface. Hold this position for 10 seconds, then repeat four times.

“The position is the first place to start,” Morrow said. “Next is how long to hold it. Once you work up to holding a wall plank for 30 seconds at a time, you can continue to increase the time or change your position.”

Changing positions might mean moving to a lower surface, such as the edge of your couch or a step, or to the floor. Once on the floor, you can do a plank on your knees and hands, or knees and forearms if you have wrist issues, Logue said.

“I also love the bird dog exercise as a way to get started,” she said. “Get on your hands and knees, then extend one arm forward and the opposite leg back. This gets you ready to do body-weight exercises and helps create core strength.”

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No matter which position you begin with, planks require attention to form. You should always tighten your core muscles while planking, along with your glutes and quadriceps, the Morrow and Logue said. Your shoulders and hips shouldn’t be sagging, and your butt shouldn’t be sticking up in the air. When in doubt, consult an expert, such as a physical therapist or personal trainer.

Paying attention to your breath is also important.

“Many people hold their breath during planks, which can be dangerous,” Logue said. “Remember to think about your breathing.”

Once you’ve got the hang of planking on the floor, consider adding some variations. There are many. Side planks involve balancing on one forearm with your feet stacked and your body sideways.

“Side planks work more of your side body and hip abductors,” Morrow said. “They’re good at strengthening your hips for good balance.”

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To do mountain climbers, start in the push-up position. From there, you employ a marching motion, bringing your right knee to your right elbow, then left knee to left elbow. You can also bring your right knee to your left elbow, and vice versa, an exercise known as a cross-body mountain climber.

Climbing planks require you to start on your forearms, with toes on the ground, then “climb” up on your hands. From there, you keep alternating climbing down to your forearms with climbing up to your hands.

Ideally, Logue said, you can create a plank regimen that incorporates both traditional planking and several variations, which will help reduce your risk of muscle overuse and create a more balanced body.

The key takeaway is to give planking a try by starting slowly and easily.

“There isn’t a point in any exercise program, whether you’re planking or walking or squatting, where you’re too old or out of shape to try,” Morrow said. “There is always a point of entry. Yours just might be different than someone else’s.”

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Sign up for CNN’s Fitness, But Better newsletter series. Our seven-part guide will help you ease into a healthy routine, backed by experts.

Melanie Radzicki McManus is a freelance writer who specializes in hiking, travel and fitness.

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How Jackass Star Chris Pontius’ Simple ‘1-Rep’ Rule Keeps Him Jacked at 51 – and Why it’s so Effective

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How Jackass Star Chris Pontius’ Simple ‘1-Rep’ Rule Keeps Him Jacked at 51 – and Why it’s so Effective

You might know Chris Pontius as ‘Party Boy’ from the Jackass films and TV series that defined the early 2000s. Now 51, he’s back on our screens for Jackass: Best and Last, the fifth and final instalment in the franchise. Away from the stunts, though, Pontius has also become an unlikely source of practical fitness advice, regularly sharing workouts from his home gym.

In a recent Instagram Reel, he shared: ‘I have a very simple exercise tip for people who are having trouble getting motivated to exercise. Just lift the weight one time, do one rep, one push-up, whatever it is, and once you’ve started you kind of go, “Well, I might as well just keep going”.’

‘So try it, it’s worked for me every time and it’ll probably work for you,’ he says.

The advice is grounded in behavioural science. By taking one small step towards your workout, you’re more likely to overcome the initial mental resistance because the task feels more achievable. Once you’ve started, it’s far easier to build momentum and complete the rest of your session.

Our Fitness Director Explains Why This Method Works

‘There’s a bit of science behind this, too,’ says Andrew Tracey. ‘Behaviour-change researchers have looked at “all-or-nothing thinking” around exercise – basically, the idea that if you can’t do the full session, exactly as planned, you may as well sack it off completely. Giving yourself permission to do the smallest possible version of the workout is a way around that.

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‘Tell yourself you’re only doing the warm-up. Or one round. Or five minutes. You’re allowed to stop there. But often, once you’ve started, you realise the hard part wasn’t the workout itself. It was getting going. Research also shows that the way a workout feels can affect whether you come back for more. So a small win that feels doable is almost always better than the perfect session you never start. So while the “minimum dose” might feel like a cop-out, it could actually be a way in.’


If there’s one thing Kori Sampson knows, it’s how to optimise your body composition for performance. To tap into his knowledge as an elite athlete and coach, we asked him to create a 4-week plan to help you move faster, recover quicker and keep pushing when the fatigue sets in – all while improving your muscle-to-fat ratio.

Ready to build muscle, burn fat and come out the other side looking, feeling and performing better? Click here to get 14 days of free access to the plan via the Men’s Health app.

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“Forget living longer, exercise can make life easier right now”—a 72-year-old fitness influencer and marathon runner shares two accessible ways to start moving

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“Forget living longer, exercise can make life easier right now”—a 72-year-old fitness influencer and marathon runner shares two accessible ways to start moving

Retirement is often a time when people slow down, but in Christine Hobson’s case, she’s speeding up. When her daughter persuaded her to join a running club so she wouldn’t get bored, she had no idea she’d get the fitness bug and run 125 marathons in total, visiting all seven continents.

And the 72-year-old former teacher has plans to run the North Pole marathon in 2027.

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Why 21-15-9 Might be the Smartest Workout Format in Fitness – and How to Use it to Drive Muscle Growth

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Why 21-15-9 Might be the Smartest Workout Format in Fitness – and How to Use it to Drive Muscle Growth

CrossFit means a lot of things to a lot of people – because it’s made up of a lot of things.

Since the rise of the fitness giant, countless brands, events and training methods have sprung up around it – not claiming to be CrossFit, but looking suspiciously CrossFit-esque.

There are, however, a handful of things that are uniquely CrossFit: the ‘Girls’ benchmark workouts. The Hero WODs and, of course, its signature rep schemes.

Chief among them is ’21-15-9′.

The 21-15-9 rep scheme may just be the single most CrossFit thing in existence. But what exactly is it? Where did it come from? And why might it actually be better at building muscle in a hurry than its conditioning roots would have you believe?

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Let’s have a look.

What Is 21-15-9?

If you’ve never encountered it before, the format couldn’t be simpler. Choose two exercises (occasionally more) and perform 21 reps of each, then 15 reps of each, then nine reps of each, completing the entire workout as quickly as possible – with good form.

Probably the best-known example is ‘Fran’: 21 thrusters and pull-ups, followed by 15 of each, then nine. On paper it doesn’t look especially intimidating. In practice, it’s one of the most feared benchmark workouts in fitness.

Where Did it Come From?

Unlike many modern training methods, 21-15-9 didn’t come out of a study. It came from the gym floor.

CrossFit founder Greg Glassman has explained that the format emerged through years of coaching and experimentation in the 1990s. Rather than chasing a perfect sets-and-reps prescription, he was looking for a workout that allowed athletes to maintain a high power output from start to finish.

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The thinking is surprisingly elegant. You begin with 21 reps while fresh. By the time you reach the set of 15, your ability to produce force has already fallen. By the final nine, you’re significantly more fatigued – but the workload has dropped by almost the same amount.

Instead of grinding through increasingly miserable sets of the same length, the workout ‘meets you where you are’, reducing the work required as your capacity declines. The result is a workout that encourages you to keep moving instead of standing around trying to recover.

The numbers themselves are also remarkably practical. Forty-five total reps per movement provides plenty of training volume without turning the session into an endurance slog, while every set divides neatly into thirds if you need to break it up.

(Although I’ve got to be honest, I’m a 20-15-10-5 man myself, just for the sake of round numbers.)

Why Does it Work So Well?

Although there isn’t research showing that 21-15-9 is somehow the magic formula, there are obvious reasons why it consistently produces brutally effective workouts.

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Descending reps help maintain intensity. As fatigue accumulates, reducing the target allows movement quality, bar speed and overall work rate to stay higher than they would if you simply repeated the same number of reps over and over.

It also tends to land in a physiological sweet spot. Most 21-15-9 workouts take between three and eight minutes, depending on the movements and the athlete. That’s long enough to create a serious cardiovascular challenge while still requiring meaningful force production throughout. You’re taxing your anaerobic systems hard while relying on your aerobic system to help you recover just enough to keep going.

Finally, there’s the psychological trick. The hardest-looking part comes first. Once you’ve survived the opening 21, every remaining round appears more manageable. ‘Only 15 left.’ Then, ‘Just nine.’ In reality, you’re becoming more fatigued with every rep, but the shrinking target keeps you attacking the workout instead of pacing too conservatively.

Why it Might be Surprisingly Good for Building Muscle

Perhaps the biggest misconception about 21-15-9 is that it’s ‘just cardio with weights’.

Choose the right load and something interesting happens. Very few athletes complete every round unbroken. Instead, the workout naturally evolves into a series of short, broken sets separated by only a few seconds of rest.

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Your 21 might become 11-5-5. Your 15 becomes 8-4-3. Your final nine might stay unbroken – or become 5-4.

In effect, you’ve accidentally turned the workout into a form of rest-pause training.

Those brief pauses allow just enough recovery to squeeze out more high-quality repetitions before fatigue catches up again. By the latter stages of each mini-set, you’re repeatedly working very close to failure, recruiting the high-threshold motor units with the greatest potential for muscle growth.

It’s a similar principle to rest-pause training, myo-reps and cluster sets: all methods used to accumulate hypertrophy-friendly volume while keeping the load relatively heavy and the rest periods brutally short.

You’re basically speed-running a large number of hard, growth-stimulating reps in a very small window of time. Could this help explain why elite CrossFit athletes often carry an impressive amount of muscle despite spending relatively little time performing traditional bodybuilding splits?

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It’s certainly plausible, although the ‘elite’ part often selects for athletes with the greatest muscle-building potential.

Much of their training isn’t simply conditioning. It’s high-density resistance training performed under accumulating fatigue, with only fleeting recovery between efforts. In other words, they’re often doing something bodybuilders have deliberately programmed for decades: packing a lot of hard work into a very short period of time.

That’s not to say 21-15-9 is superior to a well-designed hypertrophy programme. If your sole goal is building muscle, there are more efficient ways to do it.

But if you’re looking for a workout that develops fitness, tests your mettle and still provides a meaningful stimulus for strength and size, it’s easy to see why this deceptively simple rep scheme has remained one of CrossFit’s defining fingerprints for more than 20 years.

Best Bodyweight 21-15-9 Workout: ‘JT’

If you’re looking for an interesting twist on the 21-15-9 format, look no further than Hero WOD ‘JT’, which concentrates the muscle-building potential of the format into a brutal upper-body workout.

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Created in honour of Petty Officer 1st Class Jeff Taylor, who was killed in Afghanistan in 2006, the workout strips away barbells altogether and relies solely on three bodyweight movements:

21-15-9 reps of:

Don’t let the lack of equipment fool you. The volume – 45 reps of each movement, 135 reps in total – combined with the descending rep scheme makes this a brutal upper-body test, hammering the shoulders, chest and triceps while demanding serious muscular endurance.

Better still, it perfectly demonstrates one of the biggest strengths of 21-15-9. As fatigue mounts and the sets naturally fragment, the workout begins to resemble one giant rest-pause set, allowing you to accumulate a huge number of hard, near-failure reps in less than 10 minutes.

If your goal is building an impressive upper body while developing serious work capacity, there are few bodyweight workouts that deliver quite so much bang for your buck, making ‘JT’ one of my personal favourites.

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fitness magazine cover featuring a muscular man with kettlebells

If there’s one thing Kori Sampson knows, it’s how to optimise your body composition for performance. To tap into his knowledge as an elite athlete and coach, we asked him to create a 4-week plan to help you move faster, recover quicker and keep pushing when the fatigue sets in – all while improving your muscle-to-fat ratio.

Ready to build muscle, burn fat and come out the other side looking, feeling and performing better? Click here to get 14 days of free access to the plan via the Men’s Health app.


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