Declension table of ?yatheṣṭāsana

Masculine	Singular	Dual	Plural
Nominative	yatheṣṭāsanaḥ	yatheṣṭāsanau	yatheṣṭāsanāḥ
Vocative	yatheṣṭāsana	yatheṣṭāsanau	yatheṣṭāsanāḥ
Accusative	yatheṣṭāsanam	yatheṣṭāsanau	yatheṣṭāsanān
Instrumental	yatheṣṭāsanena	yatheṣṭāsanābhyām	yatheṣṭāsanaiḥ yatheṣṭāsanebhiḥ
Dative	yatheṣṭāsanāya	yatheṣṭāsanābhyām	yatheṣṭāsanebhyaḥ
Ablative	yatheṣṭāsanāt	yatheṣṭāsanābhyām	yatheṣṭāsanebhyaḥ
Genitive	yatheṣṭāsanasya	yatheṣṭāsanayoḥ	yatheṣṭāsanānām
Locative	yatheṣṭāsane	yatheṣṭāsanayoḥ	yatheṣṭāsaneṣu

Compound yatheṣṭāsana -

Adverb -yatheṣṭāsanam -yatheṣṭāsanāt