Subjects are of two categories: one category can be learned merely only through words, by listening and understanding - these are theoretical subjects, like rules and analysis of grammar. The other category needs to be practiced, like music, cooking, martial arts and yoga as well. Nowadays the practice of yoga stops with just asana. Very few even attempt dharana and dhyana (concentration and meditation) with seriousness. There is a need to search once more and reestablish the practice and value of yoga in modern times.