Sensory Perception– This is often the first problem which any practitioner would face. One is sitting, trying to concentrate and suddenly he realizes that there is a pain growing in the lower back or discomfort in the knee or maybe something else. The involuntary functions of the human body play the game here. The nerves always feel. They never stop. They carry the sensations to the mind, where mind reads that sensation, and project a resulting impulse as an answer to it. That is where we know about the significance about a quiet mind. A mind which barely reacts. Such an issue can be easy to handle if any individual has the basic requirement for starting a meditation practice and that is an erect spine.
The very essence of Hatha Yoga starts with a good and erect posture. Everything else can be ignored but a misaligned Spine, as it contains the energy points or Chakras in itself cannot be ignored. Wonderful is the energy of that person who holds a spine erect, like a trunk of a tree. It shows the stability of the mind and the vigor of the will. With such an erect posture comes a balance between several muscles which act in perfect harmony to always keep that spine upright. In every stream of Yoga, we see that there is this basic acknowledgment of sitting with an erect spine, while going in to meditation. With continuous practice, we achieve that state where the center of gravity of the body stays intact while we advance into our meditation. Needless to say, such a state of deep concentration cannot be achieved with a compromised sitting or any other posture where our nerves force our mind to react over a certain discomfort.