Rules and principles for the practice of yoga

I am a kinesiologist by training, so when doing sports, I also consider the changes caused by unilateral loading to the exposed anatomical parts of the body. 
With the practice of yoga, this can be overcome and the limitation of the locomotor potential of the human body prevented. Yoga, with its old-fashioned concept, gives today's sports a promise and a guarantee of results.
My experience of practising and studying yoga showed me that yoga with its principles thoroughly addresses and takes into account the human anatomical movement, which is the basis for perfect movement with the highest working effect for the sake of sport, especially when the movement is conditioned by a sports tool and the forces are transmitted through lever arms.
In my practice and study of yoga, I follow the rules laid down by B. K. S. Iyengar in 27 points in his book Light on Yoga.
His student Dona Holleman wrote in her book Dancing the body of Light about “the seven vital principles” and precisely analysed “anatomically wrong movement”.

Yoga reveals that there is a big difference between stretching as practised by a sports practitioner and “elongating” in yoga as presented by Holleman.
She writes in her book: “In this context it is important to be aware that there is a profound difference between stretching and elongating. Stretching is a mechanical lengthening of a certain muscle, produced by shortening another muscle, and takes place on a purely physical level. Therefore, there is a limit to stretching, beyond which the muscle will rip. This ripping happens when the power of the shortening muscle exceeds the capacity of the other muscle for being stretched.

ELONGATING is something entirely different. Deep within the fibres of the muscles there is a hidden door. This hidden door is opened by breathing and, once opened, allows the muscle to undo itself, that is, to elongate without the aid of another muscle shortening itself. For example, whereas in order to stretch the biceps muscle of the arm we contract the triceps and vice versa, in elongating we experience both muscles undoing themselves simultaneously and elongating. The result is extraordinary.” The process of elongation takes place in conjunction with gravity and breathing in the implementation of movements in asanas.

And it is no wonder that the tennis player Zverev said, after losing a game, that Djokovic plays like a 26 years old, and Rune, after winning on the tennis court, said that he would like to have the flexibility of Djoko.

But none of this sounds strange or new to me, since Ivanisevic recently revealed that Djokovic's daily yoga protocol takes an hour and a half.  
All the requirements of such a protocol are evident on the court when Djoko plays steadfastly and without limits!
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P.S.: my personal daily dose of yoga practice takes a good two hours, and I strictly follow the rules, study them and am often surprised.

Namaste!