The best time for yoga practice is either in the early morning or late in the evening. A well ventilated and clean room should be selected for the practice of yoga. Using a mat or a thick blanket is a must. Open places like garden, ground etc should not selected for the practice of yoga. Asanas should be done on empty stomach. Allowing at least 3 hours after a meal, 1 hour after refreshment and 1/2 hour after light drink such as milk is essential. Wear loose and comfortable cloths, which felicitate free movement of limbs. It is better to take bath before practicing yoga. One should not take bath immediately after the practices. After 1/2 an hour one can take bath.  Before starting practice of yoga, the bladder should be emptied, bowels evacuated and mouth should be cleaned. After completing practice of asanas and pranayama always lie down in shavasana for at least 10 minutes. There should not be any type of forceful bending and other movements. One can try only to the extent, he can perform. One should sit facing east or west or north and not to south. Women should not practice asanas during menstrual period. One should stop practicing asanas after the fifth month of pregnancy up to three or four months after the confinement except under expert guidance. After the yoga practice, one should feel fresh and relaxed, never tired, exhausted or sweating. Asanas and physical exercises should not be combined. One should practice with full concentration and awareness. There should be co-herence of the body and mind The qualities demanded from a aspirant are discipline, faith, tenacity and perseverance to practice regularly without interruption. Yoga practices Should Do under the Guidance of a Learned Teacher or  guru, and no one should not practice Yoga by seeing book, TV, etc.