The Visuddhimagga lists the thirteen ‘ascetic practices’ dhuta-angas (Dhutanga - Wikipedia). Do any Pali suttas record the Buddha teaches all the thirteen practices of dhuta as a set of practices?
One of the dhuta practices, no. 13. "Sitter’s Practice (nesajjik’anga) — living in the three postures of walking, standing and sitting and never lying down ", seems very difficult to practice, and also not good for health, both mental and physical.