It's curious enough how this ancient knowledge is passed from generation to generation over millenia, scriptures thousands years old , very vast library of knowledge including The Bible, Vedas and Puranas that are yet much older , Buddhist Cannon so called Tripitaka ( 3 Baskets of Knowledge , Dharma Pitaka, Abhidharma Kosha and Vinaya Pitaka , in other words thesis on The Teachings as commonly understood being methods and ways of Ascension, Metaphysics and Ethical Discipline respectively ) ,
all those gave life to innummerable teachings, sects and major and minor religions in various lands and various phases of our history ,
containing common roots .
Originally, all of them were taught not on wide platform but from individual Master to individual Disciples , to preserve correctness of understanding of terminology, views and methods ( of Ascension , Way to Enlightenment ).
Buddhism and Christianity in our modern times are both responsible for spreading the word freely , and passing teachings that were originally tied to specific cultural heritage to another ethnics , passing some forms and pieces of the teachings worldwide.
Followed by Hatha Yoga and all kinds of Yogic disciplines and exercises that are still of ancient origins and are still practised by living yogis in India ( mostly ) to these days , as a path of austerity , self-control, study and day to day practise ,
many modern methods originated there from, including Reiki which is just one of kinds of Pranayama techniques ( Prana -energy, Yama-control ),
integrated to many forms of martial arts such as Tai-Chi and Chi-Kuan, through out Tibetan Buddhist lore of Mahamudra teachings that are Yogic teachings in Origin ( Yoga School of Philosophy, Practise and Initiation rather than Hatha Yoga as specific physical exercise ),
to all of those 'modern' so called meditation methods of sounds and frequencies ( again, the same Teachings are described in Vedas in detail accompanied by thorough analyzis of human neuro-biological system with all its channels -Nadis- and energy centers -Chakras , sounds, colors and harmonics )
Sacred Geometry ( Yantras and Mandalas ) drawn and recorded from very old times and cultures and still practised to this day ,
visualisations and multiple trainings of concentration and meditation methods , again, borrowed freely from this ancient lore , given new names, new credits, such as Remote Viewing etc.,
all of that knowledge and spirituality came to be useful to modern man.
Some of it being faked and misunderstood while some are carefully trying to touch the roots of the real knowing ..