Iyengar yoga

Iyengar yoga is a precise, slow system of hatha yoga in which each posture is taught in exact anatomical detail and props are used freely so that any body, whatever its limitations, can be arranged correctly in the shape rather than approximating it.

It was developed by B.K.S. Iyengar over a teaching life of more than seventy years, and it is the source of almost every prop you will find in any yoga room anywhere in the world. The block under your hand in a gym yoga class came from this system. So did the belt, the bolster and the practice of standing a nervous beginner's heel against a wall.

The idea underneath all of it is worth stating clearly, because it is frequently misunderstood as a concession to weakness. A prop is not there to make a posture easier. It is there to make the correct posture available to a body that cannot yet reach it unaided, so that the correct thing is what gets practised. Practising an incorrect shape for a year makes you very good at an incorrect shape.

An Iyengar class is unlike any other yoga class in its rhythm, and people arriving from a flowing background often find the first one bewildering.

There is a lot of stopping. The teacher will demonstrate a posture, then talk about one specific aspect of it, then have the room do it, then stop everybody and correct a common error, then have them do it again. There may be five or six standing postures in an hour, each visited more than once. There is often a period where you stand and watch somebody being adjusted, which is not wasted time in this method: watching a correction on another body is one of the most effective ways to understand it on your own.

The instructions are anatomically specific in a way that can be startling. Not stretch your arm, but extend from the inner elbow to the outer wrist. Not straighten your leg, but lift the inner knee and press the outer heel down. For some people this is the moment yoga stops being vague and becomes real. For others it is the moment it stops being enjoyable. Both responses are common enough that neither is a wrong reaction to the style.

Sequencing is also deliberate over the year rather than only within the hour. Terms tend to focus on families of postures: standing work, then backbends, then forward bends, then the inversions. It is one of the few systems that genuinely teaches a curriculum rather than a series of classes.

The prop list looks like equipment and is really a set of teaching decisions.

• The block. Brings the floor closer. In trikonasana, a hand on a block instead of a shin means the chest can open properly instead of the body collapsing forward to reach down. It changes what the posture is, not how hard it is.
• The belt. Extends the arms. It lets somebody who cannot clasp their hands behind the back do the shoulder work that the clasp exists to produce.
• The chair. Makes backbends, forward bends and even inversions available to people who could not otherwise approach them. This is the prop that matters most for older students and it is dramatically underused outside this system.
• Blankets. Under the shoulders in shoulderstand, to protect the neck, which is not optional and which most non Iyengar classes omit. Also under the hips in seated postures, so a tight pelvis is not forced to round the lower back.
• Wall ropes. The most distinctive and least portable. They let the spine be traction stretched with no muscular effort, which is the sort of thing that is very difficult to arrange any other way.

The unglamorous point about all of this: the props are how the system delivers on its claim to be for every body. Take them away and you have a demanding style that suits the naturally flexible, which is what a good deal of modern yoga has drifted into being.

Iyengar yoga has been studied more than most styles, largely because its standardisation makes it easier to research: if a trial says Iyengar yoga, everyone in the room really was doing the same thing.

A systematic review of six randomised controlled trials covering 570 patients found that Iyengar yoga was effective for both back and neck pain compared with control groups, with strong evidence for short term effectiveness and little evidence about whether the benefit lasts. That last clause matters and is usually left out when this research gets quoted. The honest summary is that it helps in the months during and shortly after the intervention, and nobody has shown what happens two years later.

My own reading, and it is a reading rather than a finding, is that the prop use is the likeliest reason this style performs well in back pain trials. A person with a painful back can be placed in a supported posture and get the benefit of the position without the loading that would otherwise aggravate them. That is not available in a style that treats props as a crutch.

What the research does not show, and what I would not claim: that Iyengar yoga is superior to other styles for general health, fitness or wellbeing. The comparison trials for that do not exist in any quantity, and style loyalty is a poor substitute for evidence.

The decision here is unusually clean, because this style is very good at a specific set of things.

• You have chronic back or neck pain. Iyengar, if you can find a certified teacher. This is the style with the best evidence behind it for that problem, and the props are why.
• You have a marked asymmetry, an old injury, or one hip that behaves differently from the other. Iyengar. Nobody else looks that closely.
• You want to understand the postures rather than perform them. Iyengar, without hesitation.
• You are over sixty, or nervous about getting to the floor. Iyengar, and ask specifically about chair work.
• You want breath work and meditation as a large part of the class. Not Iyengar, at least not in the early years. Pranayama enters the syllabus later and standard classes are posture dominated. A classical hatha class gives you more of it sooner.
• You want to sweat and to move. Not Iyengar. Read hatha vs vinyasa instead.
• You find detailed instruction irritating rather than clarifying. Not Iyengar. You will not last, and there is no shame in knowing that about yourself.

My verdict. Of all the styles I do not teach, this is the one I most often send people to, and I send them for a specific reason rather than out of general admiration. If somebody comes to me with a persistent back problem, or with a body that is markedly uneven, the hour taught here can help, but a good Iyengar teacher with a rope wall and a chair can do things I cannot. The reservation I hold is about breath. In forty years I have become steadily more convinced that pranayama is where the durable change happens, and an Iyengar student can spend several years almost entirely on postures. So my honest recommendation, for somebody who has the time, is Iyengar for the body and a slow practice with real breath work in it for the breath, and if you can only have one and you are in pain, take the Iyengar.

To be plain: Iyengar yoga is not taught here and I hold no certification in it. The classes here are not labelled by style at all. The hour covers asana, pranayama and relaxation, taught slowly, with props used where they help but without the rope wall, the chair work or the syllabus that a certified Iyengar teacher would bring.

Where the two overlap is in the insistence that a posture done approximately is not the same as a posture done correctly, and in the willingness to put a block under somebody's hand rather than let them collapse. Where they differ is emphasis: an Iyengar class will spend an hour on the detail of four standing postures, and the hour here is divided between postures, holding fewer of them well, and a genuine share of the time given to the breath.

If the precision described on this page is what you want, look for a teacher with a current Iyengar certification, which is unusually reliable as certifications go and involves years of assessment. If a slower hour with breath work in it sounds closer, that is what is on offer here, and the classes page has the timings. Either way, the ten minute morning routine on this site is a reasonable place to practise the standing postures precisely at home.

The method is easiest to understand by watching what it does to poses you already know, rather than by reading its principles.

Trikonasana is the emblem: the hand goes to a block rather than the floor, and the whole point becomes the turn of the chest rather than the reach. Tadasana is taught at a wall so that a student can feel where they are arching. Adho Mukha Svanasana gets the head supported on a block, which changes it from a strengthening pose into a resting one. Setu Bandhasana over a block is a fixture, and Savasana gets a bolster and a folded blanket rather than a bare floor.

All of that is the same instinct as the ten minute morning routine on this site: raise the floor to meet the body rather than the other way round. It is also why the method has the strongest research record of any style, particularly for back pain and for beginners over 40, where the ability to make a pose easier without abandoning it is the whole game.