The Satcharitra mentions some unusual physical feats Baba performed. Can you explain what Khanda-yoga was and other similar practices he engaged in?

Chapter 7 of the Shri Sai Satcharitra describes Sai Baba's practice of Khanda-yoga, which involved the apparent disjointing of his own limbs. The text states that his hands, feet, and head would sometimes be separated and then joined back together as before, a practice he performed along with Samadhi. This chapter also mentions other experiments like Dhauti, which is a cleansing of the stomach, and Poti. These incredible accounts are presented as examples of how Baba toiled for the benefit of others, even wearing out his own body to bear the sufferings of his devotees.