When you want to learn and practice yoga, you have to face many obstacles.
There are many types of sickness or disease such as physical disease, mental disease, emotional disease, intellectual disease, etc. All these are called vyadhi.
Sthyana means sloth inertia, dullness, incompetence.
Samshaya means doubt. Doubt leads to indecision. Indecision slows down to take up the practice of yoga.
Pramada maybe due to a mistake, or a blunder or to madness or due to an oversight; due to intoxication.
Alasya is the greatest enemy of the human body.
Avirati being an indiscriminately intense desire or enthusiasm is an obstacle for the practice of yoga.
In bhranthi darshana, the practitioner perceives the knowledge, instruction and training in the wrong way which becomes an obstacle to the practice of yoga.
Alabdha bhumikatva means lack of perseverance.
Anavasthtitatva is the unsteadiness of mind, and attention in the pursuit of the inquiry and distractions.
Dhukha, Daurmanasya, Angamejayatva, Svasa prasvasa are the four companions of distracted mind.