in Yogasūtra, niyama refers to the second limb (aṅga) of Yoga meaning abstinence, restraint, reserve, discipline, observance, austerity, practice resulting from a vow. These are the constraints imposed on oneself including : shaucha, santosha,tapas, svadhyāya, îshvara-pranidhâna
Niyama
in Yogasūtra, niyama refers to the second limb (aṅga) of Yoga meaning abstinence, restraint, reserve, discipline, observance, austerity, practice…