Hatha yoga postures come in numerous forms. For a beginner, states the historian of religion Mircea Eliade, these "asanas" are uncomfortable, typically difficult, cause the body shakes and typically unbearable to hold for extended periods of time. However, with repetition and persistence, as the muscle tone improves, the effort reduces and posture improves. According to the Hatha yoga texts, each posture becomes perfect when the "effort disappears", one no longer thinks about the posture and one's body position, breathes normally per "pranayama", and is able to dwell in one's meditation ("anantasamapattibhyam"). The "asanas" discussed in different Hatha yoga texts vary significantly. Unlike
Aranyaka however, neither are homogeneous in content nor in structure. "Aranyakas" are sometimes identified as "karma-kanda" (कर्मकाण्ड) / (कांड), ritualistic action/sacrifice section), while the Upanishads are identified as "jnana-kanda" (ज्ञानकाण्ड /कांड) knowledge/spirituality section). In an alternate classification, the early part of Vedas are called Samhitas and the ritualistic commentary on the mantras and rituals are called the Brahmanas which together are identified as the ceremonial "karma-kanda", while "Aranyakas" and "Upanishads" are referred to as the "jnana-kanda". In the immense volume of ancient Indian Vedic literature, there is no absolute universally true distinction between "Aranyakas" and "Brahmanas". Similarly, there is no absolute