This is a gradual training. 

Find somewhere secluded where one won't be disturbed.

Putting aside longing and dejection in regard to the world.
Setting aside all worldly concerns. 

One trains thus:

Mindfulness of the body

1. To begin just simply notice if the breath is long or short.

2. Then pay attention to the whole of the breath from start to finish.

3. Become sensitive to the body as you breathe in and out. 

4. Breathe calming the body. 

Mindfulness of Feelings

5. Breathe sensitive to joy.

6. Breathe experiencing pleasure. 

7. Breathe sensitive to thoughts.

8. Breathe calming thoughts.

Mindfulness of mind states:

9. Breathe sensitive to one's state of mind.

10. Breathe satisfying and gladdening the mind.

11. Breathe steadying the mind.

12. Breathe releasing the mind.

Mindfulness of dhammas:

13. Breathe contemplating change. (impermanence, anicca, dependent origination). 

14. Breathe contemplating the fading of craving. (Dispassion)

16. Breathe contemplating cessation. (of suffering).

17. Breathe abandoning greed, hate, and delusion. (renunciation).

...

The breezes at this time of year are very pleasant.  And the blackbirds and song thrushes are singing all around and it is beautiful. I enjoy having my window open or sitting outside, and being absorbed in it all, lifts up my heart.

The air kasina is great to practise at this time of year, in the Northen hemisphere at least. We have lots of breezes at the moment. Air kasina is basically breath meditation, but there's a component to it which isn't often taught. Which is to focus on the sensation and feeling of the air element as it touches the skin, and notice how that affects the mind. Apparently in ancient times a monk wanting to learn the air kasina would find a cave high in a mountain where there was a breeze and practise there. In modern times, one can practise this in any location with a plug in fan (-:

The fresh air can feel invigorating, and this feeling of invigoration is a breath nimitta. A tactile nimitta, some people get a visual nimitta, but for me the nimitta is always a tactile feeling. In Pali, nimitta means sign. And in this context it is the sign of the air element in the mind; or the effect that the air element has on the mind. It is a mind-generated phenomena, an internal feeling created in response to the air element.

If you stay centred with the nimitta it grows stronger and will expand and fill the whole body, which feels very pleasant and healing. One then keeps intending to stay with it, sustain it, soak the entire body with the tranquility and happiness. This can be challenging to do at first, but it gains momentum over the long term. With consistent practise the nimitta and the feeling of joy and pleasure grows, snowballs, and becomes more effortless and automatic. This is how the mind works, how we create sankharas. Samhadi begets more samhadi, i.e. what we practise grows stronger and becomes a habit, which then carries a momentum and energy of its own that continues and grows deeper.

After many hours of practise, one will be able to bring the air nimitta up at will, without needing a breeze. One can just incline the mind towards it and it will appear. Even the slightest zephyr of air movement in a room will bring it up. Sometimes one can go into absorption just watching the air blowing through the leaves of the trees and plants, or from the ripples it makes on the surface of water. It feels like magic, but it is just how the mind works. The same thing can happen when meditating on any other element, a colour, or on love. One will start to notice it more and more in the world around them and find this will bring up the samhadi associated with it. 

A teacher told me that for those brief moments when people take a break from being in a stuffy room and stand outside and enjoy the feeling of the breeze on their faces. For those brief moments those people have been practising breath meditation. He added that when it comes to samhadi, the Buddha says, use the low-hanging fruit. Find that which comes natural and then make it into something supernatural (-:

One trick Buddhist monks apparently have for helping them learn breath meditation is to put some menthol under their nostrils (-:

I accidently did this today when doing an olbas oil inhalation to help with my sinuses. I accidently got some under my nostrils, and can confirm it does make breath meditation more interesting, and also seemed to help a little bit with the brain fog.

I am not sure olbas oil is the best thing to put under the nose though, must research some skin-friendly alternatives (-:

I am enjoying meditating on the breath energy at the moment and moving it throughout the body. It helps me maintain interest and curiosity in the breath as a meditation object, and it feels enjoyable and invigorating.

I place my attention on the cool air going into the nasal cavity and the warm air going out, like the waves of the sea going into a cave, breathing in, breathing out. I become aware of the whole body at once, feel the breath energy travel deep into the body, into the lower belly and down into my feet and toes, making them tingle with happiness. I feel it in my hands also as I breathe in and out. The energy permeating the whole body, like the ocean filling inner coves. It feels cool, soothing, and refreshing. The spine tingles, and the scalp and back of the neck lights up with pleasure. The feeling of air and the touch of clothing on skin feels pleasant, and the body is comfortable and at ease. The cool air all around me enters the pores of my skin with each inhalation, nourishing every fibre of my being. It feels wonderful.

After a while of doing this, the energy becomes more settled and serene, and then it feels good to stop moving the energy round the body, and just let it be, resting quietly in the awareness of the inner body. The energy bubbles and flows gently on its own, and the mind settles into a peaceful state, composed, content and lucid. Not wanting to be anywhere else. The body and mind feels satisfied and becomes very still, no longer harrassing itself, tranquilised and at peace (-:

It doesn't matter if this is supported by science, meditation is not about objective reality. Meditation is about the subjective reality. It is about the inner world, the inner body, inner being. In meditation, the chakras, the breath energy, magic can all be real, and it can heal.

I read an article recently about the power of the placebo effect, and I wonder if that is an indication of the magic potential of the mind when it comes to the subjective experience (-:

I wonder if that was the meaning behind the movie: 'Life of Pi'. If that film was about the importance and value of the subjective experience, because that is where we live.

I am starting to realise that many of our problems are not really problems, they are just mental constructs and imaginary fears that don't need to be resolved at all. They just need to be dissolved by tranquility. Then whatever's left is easier to work with and understand.

 Present to the here and now, embodied, anchored, centred with the breath. 

Attention not too forceful or too lax. 

Not a laser beam type focus, not a  contracted awareness. But with an open and expansive awareness, a holistic awareness that includes it all, everything that is happening in the here and now, not grasping for or pushing anything away. Remaining composed and still, with the breath and the whole body at the centre. An anchor for attention. The breath energy like the changing waves of the ocean. 

Allowing it all to happen, whatever is present in the here and now, the sense impressions, the thoughts, feelings, pleasant or unpleasant. Letting things arise and cease without trying to change them or make them otherwise; but also not going along with them, not being drawn in and pulled in different directions by them. 

Not getting involved and tangled up by desire in its three forms, not following the passion, aversion, or selfing. Not making it into a story. Not trying to change the world, not judging anything, not pushing anything away, not clinging to it, and not adding anything to it.

 Just anchored in the body, composed and still. Present to the present moment and letting things be as they are, life as it is, the good, the bad, and breathing through it.

Are there other worlds existing alongside this one?
Irradiant kingdoms and castles in the sky.
With strange and fantastic beings 
living beyond our locked up cognition,
our dry empty material condition.
Of money, concrete blocks and consumer dreams.
Our TV eyes blinking;
but nothing is what it seems.

Blinded by dark arts of finance and
drab clinical reality of so cold science.
Industrial noise, greed, sorrow and disease.
Beings factory farmed by dead machines.
The wheel of consumerism keeps on churning
crushing and breaking everything in its path.

Yet sitting still in serenity
I hear celestial music play.
See strange beings traverse the air,
Their otherworldly kingdom moved 
by the rhythmic push and pull of my nostrils.