Many austerities were performed in the Satya-yuga, Dvāpara-yuga and Tretā-yuga, but not in this Age of Kali. In this Kali-yuga, one can attain the same results simply by chanting the Hare Kṛṣṇa mahā-mantra. Because the people of this age are fallen, the Lord is kind enough to give them the easiest method. Simply by chanting the Hare Kṛṣṇa mantra, one can attain the same results. However, as Lord Caitanya Mahāprabhu points out, we are so unfortunate that we are not even attracted to chanting the mahā-mantra — Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare.