Nathamuni's Yoga Rahasya is an important text on Yoga that was lost for many centuries. The revival of this text by T Krishnamacharya, brings to life the great Yoga teachings of Nathamuni, a ninth-century Yogi and Vaisnavite saint. Important concepts presented in this text include - importance of Yoga for Women, Yoga practices to be done during pregnancy, adaptation of Yoga to suit individuals in different stages of life and Yoga as a key tool in therapy.