Vajrasana (Thunderbolt Pose)

Vajrasana means the thunderbolt pose or the diamond pose, from vajra, the thunderbolt, which in Indian thought also carries the sense of something indestructible and hard. You kneel, you sit back on your heels, and you sit up straight. That is the whole shape.

Its practical value is that it solves a problem that stops a great many adults from having any seated practice at all. In a cross legged seat, a stiff hip tips the pelvis backwards, the lower back rounds, and the student cannot sit upright for five minutes without effort. In Vajrasana the shape of the kneeling position tips the pelvis gently forward instead, so the spine stacks up over it and stays there without being held.

The limiting factors are different: the knees and the ankles rather than the hips. Which is why a great many people who cannot sit cross legged can sit like this happily, and a smaller number who sit cross legged easily find this one impossible. Try both, use whichever your body offers you, and do not conclude anything about your ability from either.

Most people's first attempt at this pose is painful, and they conclude their knees are the problem. Usually the problem is that they sat down without preparing anything.

In order of usefulness:

1. Put height between the buttocks and the heels. A folded blanket, a firm cushion, a yoga block laid flat, or a bolster laid lengthways between the shins. Add as much as you need. Twelve centimetres is not excessive for a stiff adult.
2. Move the calf flesh outwards with your hands before you sit back. It lowers you, spreads the contact, and takes the pressure off the ankle.
3. Roll a small towel under the ankles if the front of the ankle is what hurts.
4. Widen the knees to a hand's width apart, or more.
5. Kneel on a folded blanket, not a thin mat, so the kneecaps have padding.

With all five in place, almost anybody without a knee injury can sit here comfortably. And comfortable is the whole point: a seat you are negotiating with is not a seat, it is a posture, and you cannot breathe or meditate in it.

You will have read that Vajrasana is the one pose that can be done straight after eating, and that fifteen or twenty minutes of it after every meal aids digestion. It is the most repeated claim about this posture in India, so it deserves a straight answer.

The traditional teaching is real and old. This is genuinely the posture that hatha yoga singles out as suitable on a full stomach, when every other asana requires an empty one. That much is well attested in the tradition.

The physiological claims are not established. The explanations that circulate, about accelerated gastric emptying, increased vagal tone, or blood being redirected to the digestive organs, have no primary research behind them that I have been able to find. They are repeated across wellness sites without a source. I am not saying they are false. I am saying nobody has shown them to be true, and you should treat anybody who states them as fact with some caution.

The duration advice is worth questioning. Fifteen to twenty minutes of kneeling, three times a day, is a lot of sustained pressure on the nerves that pass around the knee and down the leg. Documented cases of posture induced foot drop have followed prolonged kneeling, squatting and cross legged sitting. If you want to sit after a meal, sit for five minutes, sit on a bolster, and get up the moment anything tingles.

What I tell students honestly is this: sitting upright and quietly for five minutes after a meal is a pleasant and settling thing to do, and it is certainly better than lying down or reaching for a phone. Whether it is doing anything specific to your stomach, I do not know, and neither does anybody else.

This is where I think the pose earns its place, and it is often overlooked in the fuss about digestion.

A seated breathing practice needs three things: an upright spine that will stay upright without effort, an open chest so the ribs can move, and enough comfort that you forget your legs within a minute. Vajrasana delivers all three for a large number of adults who cannot get them from a cross legged seat.

Practical arrangement. Sit on enough height that you are genuinely comfortable, hands on the thighs, eyes closed, and give yourself a minute of ordinary breathing before you start anything. Then run through Anulom Vilom for nine rounds, or Bhramari for six, or simply watch the breath.

The one thing to watch is the clock. A breathing practice of ten or fifteen minutes is longer than most people should kneel in the first months, so either build the duration slowly or move to a chair for the longer sittings. There is no merit in a numb foot and a beautifully executed pranayama.

Two different warning signs, and they mean different things.

Pain in the knee joint itself, particularly at the front or along the inner side, means the joint is being loaded in a way it does not like. Get more height under the buttocks, widen the knees, or stop kneeling altogether and use a chair. Anyone with a meniscus injury, arthritis, or a knee replacement should not be sitting on their heels at all without clinical agreement.

Pins and needles, numbness or a dead heavy feeling in the foot or the lower leg means a nerve is being compressed. This is not something to build tolerance for. Come out, straighten the legs, and wait until the sensation is completely normal before doing anything else. A clinical series of posture induced peroneal nerve palsy found foot drop following prolonged squatting, cross legged sitting and lying, with a mean compression time of around two hours; most patients recovered fully within twelve months, but about a quarter were left with lasting motor or sensory deficit.

Two hours is far longer than anybody sits in this pose, so there is no cause for alarm. But it does mean the direction of risk is known, and it means the sensible response to numbness is to stand up rather than to breathe through it.

Two to five minutes to start. Ten minutes at most for a while. Longer only once you can hold ten minutes with no sensation whatsoever in the knees, the ankles or the feet.

A month:

• Week one: two minutes, with plenty of height under you, twice a day.
• Week two: three minutes, adding the calf flesh adjustment, and noticing whether the ankles or the knees are the limit.
• Week three: five minutes, with a breathing practice added so the mind has something to do.
• Week four: eight to ten minutes, reducing the height under you by one fold if it is comfortable.

Afterwards, come out slowly. Lean forward onto the hands to take the weight off the ankles, straighten one leg at a time, and sit for a moment before standing. Standing straight up on legs that have been folded for ten minutes is how people stumble. A minute in Downward Dog, or simply walking about, is a good counter movement for the knees and the ankles.

This is the only posture here that has a use after a meal, so the table is organised by why you are sitting rather than by how long you have practised.

A folded blanket between the calves and the thighs, and a rolled towel under the ankles, turns this from an endurance test into a seat.

Vajrasana is unusual in that it is the only seated posture I will let a student take within twenty minutes of eating, and that single fact is why it appears where it does.

• Yoga for diabetes uses it as the after meal sit, five to ten minutes, which is a habit rather than an exercise and is the easiest thing on the whole page to keep up.
• Yoga for high blood pressure uses it as the seat for breathing practice, because it holds the spine upright without the hip demand of a crossed legged position.

In sequences it is the seat used in the bedtime routine and, with a chair standing in for the floor, it is the posture behind the seated work in the desk sequence. If the ankles or the knees object, a folded blanket under the ankles and another between the calves and thighs solves nearly every complaint, and the same props make Balasana comfortable.

It is also the seat I would rather see under a breathing practice than a cross legged shape somebody is fighting. Nadi Shodhana and Ujjayi both go better from here, because the spine is upright without anybody holding it up. If the ankles complain, a rolled towel under them fixes it, and the same prop makes Marjariasana comfortable on the knees. It is the seat used at the end of the ten minute morning routine and it is the one posture in the hatha vocabulary that doubles as ordinary furniture.