What I wrote already
JhÄna-constipation ⛜š: A condition where one is practicing the method of attaining JhÄna correctly, but energy channels are partially blocked.
jhÄna force, and equation: quantitative analysis of jhÄnic force.
J.A.S.I. ('Jazzy') effect: ”JhÄnic Automatic Spinal Inflation”: this is what you feel when the jhÄna force is propogating through the space of the entire physical body.
šPIE: šPIE = (P)recious (I)nternal (E)nergy.
If you maintain genuine celibacy (not even thoughts of lust), mostly dwell in noble silence (2nd jhÄna or better), minimizing talking and other activities that drain PIE,
then your jhÄna battery charges and fills with PIE, and the jhÄnic force gets stronger.
Adding a few more explanations to tie things all together.
Sexual impotence and jhÄnic impotence share a root cause.
Too much sexual activities that drain the PIE, causing a PIE deficit.
People can also drain PIE enormously with recreational drugs and intoxicants, alcohol, staying up all night and playing video games, partying, singing, etc.
jhÄnic impotence:
This is a state far worse than jhÄna constipation. With JhÄna constipation, jhÄna force is strong but energy blockages are not dissolved yet, and you feel tight knots and various kinds of discomfort and even sharp pain when you're doing jhÄna meditation properly.
With jhÄna impotence, the jhÄna force is weak, PIE is weak, like when a battery has weak voltage and low current. Vital functions of the body don't work properly.
If one does jhÄna meditation correctly while in jhÄna impotent state with low jhÄna force, PIE deficit, you're likely to experience various physical pains, psychosis, mental illness.
Even young kids who are overly sexually active can get into this state. It's probably a lot more common now a days with high speed internet, easy access to rich media porn, dating apps to hook up with other promiscuous kids.
When you hear about really disastrous cases of meditation causing extremely negative effects (like psychosis) in people meditating correctly, odds are high they are in a state of jhÄnic impotence, low energy state with a PIE deficit.
Of course modern medical "experts" would disagree, saying that regular sexual activity (including daily masturbation) is healthy and not a cause of psychosis.
Then they blame the meditation as the cause of the psychosis.
If you want to get out of sexual impotence or jhÄna impotence, then go celibate. Eat healthy, get at least an hour or two a day of moderate to moderately vigorous physical exercise, and you will recover from this eventually.
If you listen to modern medical "experts", you'll take medications that may alleviate some symptoms of psychosis, you will never get truly better.
The real problems in most cases are a PIE deficit and a weak jhÄnic force that can't distribute the PIE everywhere in the body.
the physics of jhÄna
The optimal posture to maximize jhÄnic force is sitting in full lotus.
But you get a fraction of full jhÄnic force in any posture with proper training.
As a rough estimate, if full lotus gets you 100% of jhÄnic force,
standing could get you 70%
lying down could get you 70-100%,
walking, taiji quan can get you 50%,
As long as the jhÄnic force is running at a level beyond a normal non-jhÄna meditator doing ordinary physical activities, you'll get a net gain in PIE accumulating daily, and gradual increase in jhÄnic force leading to increasing higher states of jhÄna, better health, better immune system, increasingly sharper mind, better memory, better mental faculties.
When you're in jhÄna, you feel tangible forces coarsing through every cell of your physical body.
JhÄnic force is trying to constantly course through all the interconnected loops of energy in the body, dissolving any blockages along the way gradually.
jhÄna equilibrium
The jhÄnic force running everywhere is balancing the 4 elements of the body (solidity, heat, liquidity, wind force). When it's in proper balance, it's fourth jhÄna, a state of jhÄna equilibrium.
How are the first three jhÄnas not in equilibrium?
first jhÄna
The first jhÄna is more dominant in solidity, hardness, like ice (solid form of water).
You get surges of heat and jhÄnic force melting the hard ice into water, but the surges are both interrupted and triggered by vitakka and vicÄra, thinking and evaluation with mental talk, verbal thoughts unspoken.
In other words, V&V used skillfully is what drives first jhÄna, but the extraneous energy expenditure of first jhÄna V&V prevents the strong force of second jhÄna.
second jhÄna
second jhÄna, you've learned to keep the foot on the pedal to the metal, the jhÄnic force is unadulterdated, not surging on and off interrupted by V&V.
The feeling of liquidity is more dominant here of the four elements.
Wind force (jhÄnic force) and heat have melted most of the ice in your body into water, the runs up from the base of your spine up your back to the top of your head, and feels just like the jhÄna simile says, like you're sitting in a lake with your butt on the spring that forcefully feeds jets of hot water from the bottom of the lake.
It feels like a jacuzzi where you're sitting on the jets.
If you got a full second jhÄna going, and your microcosmic orbit opened up, from the top of the head the river of gushing spring water goes down your face, chest, feeding into the belly area.
third jhÄna
Third jhÄna marks a stage much closer to jhÄnic equilibrium for 4 elements in balanced harmony.
What's calmer here, compared to second jhÄna?
Physically, second jhÄna force and heat melted all the ice and liquified the body, strong currents of hydraulic force distributing the liquified state everywhere.
So now the physical mostly cuts off, the force that remains just gives you subtle vibrations of physical pleasure, as opposed to the strong hydraulic raging rivers from second jhÄna.
The body is all water, the water is calm and still.
Mentally there is more pacification because PÄ«ti, mental joy, is dropped. That is, any extraneous energy needed to cause mental joy is dropped. For example as an analogy, you hear a funny joke, second jhÄna is like you're laughing out loud body shaking, third jhÄna is you're just smiling, body is calm but you have warm fuzzy sensations.
As jhÄnic force is sublimating four elements into a higher energetic state of PIE,
this manifests as heat element evaporating water into empty space and visible light.
If you have enough PIE, you perceive visible light maybe like the size of a button around the middle of your head, white color, or blue color, or red, or grey.
That is what the white, blue, red lotus are alluding to in the pond with still clear water in third jhÄna.
fourth jhÄna
From second jhÄna on, once you know how to get mental and physical tension out of the way, it's like you're flooring the pedal to the metal on your car accelerator, and someone with no jhÄna or anti-jhÄna has their foot stomping on the brakes instead of the accelerator.
Once you know how to do second jhÄna, you automatically will gradually move to third and fourth jhÄna if you stay with the program being celibate, noble silence, keeping wasteful usage of PIE to absolute minimum.
Fourth jhÄna, as jhÄnic force continues to improve the equilibrium and harmony of the 4 elements, visible light and space (feeling of emptiness of hardness element) continue to increase.
This is why the fourth jhÄna simile is a man covered completely with a white cloth.
It literally is like that.
Try it out.
Cover yourself with a large white cotton cloth.
Look through the cross patterns of the threads of the white cloth, it's like transparent white that you can see through.
The small button of light from third jhÄna? If you keep doing the work of jhÄna, letting the jhÄnic force increase and PIE accumulate day by day, the light gets bigger, stronger, brighter.
Your body gets lighter (weight, not visible light), even you step on the scale you still weigh the same as you did before (in force pounds, kilos), you somehow feel much lighter weight, and you feel levitation is possible someday.
As you get more and brighter light, your mind gets sharper and more clear, your memory gets better.
Your bullshit detector is mighty.
You can discern corrupted dhamma from proper dhamma.
You're not fooled by charismatic teachers who talk eloquently but don't teach or do the genuine Buddha's jhÄna.
And you're definitely not impressed by smart people with impressive credentials and published works but no actual jhÄna experience.
from jhÄnic impotence, to jhÄnic omnipotence
If you develop fourth jhÄna to the point of imperturbable fourth jhÄna, equivalent to well developed iddhipada,
then the 3 higher knowledges or all 6 knowledges are within reach.
If you attain the 6th knowledge, the destruction of asinine inclinations, the attainment of arahantship, then you've reached jhÄnic omnipotence.