Sometimes my mind runs amok, galloping quickly, in a forward flight, at the speed of light. It reaches other universes, goes to other lives, far, far away from the here and now.
My heart wants to follow, accelerating, never getting close. My breathing accelerates, slows, is disoriented and decides to stop..apnea..the body gives in, surrenders. Impossible to travel so far, to other worlds, to other lives, to other wars. Impossible.

The mind is a very useful tool one that we can develop for creative and constructive functioning. We can train it to rest when we need rest and to perform at full capacity when that is what we want, instead of suffering in obsessive loops. Almost everyone lives life jumping from the past to the future, and passing through the present in an ad hoc basis, often unconsciously and almost accidentally.

One of the most effective pranayamas to get the mind to stop galloping aimlessly is samavritti pranayama, square breathing. Sama: equal, regular, smooth and vritti: movements or fluctuations.
Normally our natural breathing process consists of two phases: inhalation (pûraka) and exhalation (rechaka) but the pranayamas also include the retentions that can be full-lung (Antar Kumbhâka) and/or empty-lung (Bahya Kumbhâka).
How to practice square breathing:
-Sit in a comfortable posture with your back erect.
-Breathe through both nostrils comfortably and quietly. Take several full, natural breaths.
Once you have concentrated on your breathing you can begin to practice square breathing with the same duration of the four phases:
-Inhalation
-Full lung hold
-Breathing in
-Empty Lung Retention
You can practice with the count of 3 or 4 seconds depending on your own breathing capacity. To begin with, you can do it in cycles of 4 laps (imagine a square and go around it 4 times) and with time and training, you can extend the time of the phases. The important thing is that the 4 phases last the same amount of time (Sama vritti) and that you feel comfortable, without forcing.

Produces a feeling of calm and relaxation in the mind and body.
Improves oxygenation of the brain, allowing for greater concentration.
Square breathing can help you reduce stress and improve your mood. It positively influences conditions such as generalized anxiety disorder (GAD), panic attacks, post-traumatic stress disorder (PTSD) or depression.
It can also help treat insomnia since it helps calm your nervous system.
Contraindications:
If you respect your rhythm, without forcing, it has no contraindications except for pregnancy. During pregnancy breath retention is not recommended so, if this is your case, you can simplify this pranayama by equalizing the inhalation and exhalation times as long as you feel comfortable and do not feel dizzy or fatigued.
As always, consult your doctor if you have any doubts.
And remember, whenever your mind travels faster than you, you can recover the present by concentrating again on your body, your body breathing, nothing is more in the here and now.