No matter where you sit, the key to good sitting is regular movement and changing your position often.
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(The Conversation)For thousands of years, humans have rested on the ground using variations of a squat, cross-legged or a kneeling position. And despite the availability of chairs and things to sit on, sitting on the floor is still common in many cultures.
According to reports, many English-speaking people refer to floor sitting as "Indian style," though it's also known as "Turkish style." In Korea, it's called "Yangban style" -- named after the traditional ruling class. While in Japan, the formal way to sit is called "seiza," which involves sitting on the heels with the knees resting on the floor.
In yoga, sitting cross-legged on the floor is known as "sukhasana" or lotus -- claimed to have been designed to stretch the muscles, improve posture and bring peace of mind. Some people claim that if you sit in this position while eating it helps digestion.
These cross-legged, squatting and kneeling positions stretch your hips, legs, pelvis and spine helping to promote natural flexibility and movement. Given that people now spend increasing amounts of time sitting during the day, should we be opting for the floor over a chair in the interest of our health and well-being?
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Effects on the body
Anecdotal and clinical evidence have shown that different ways of sitting place different physical stresses on our bodies. Sitting for a long time in the same position normally affects the structure of your low back, called the lumbar region of the spine and the movement characteristics of your pelvis. And it's believed this might lead to health problems in the long run, such as arthritis.
This is why people are normally advised to make use of appropriate supports or assistive devices and to switch positions often when sitting for a long time.
Researchers and doctors have looked at the ergonomics of sitting on chairs and have provided a variety of tips on sitting upright and how to avoid long-term health problems. But there is actually little scientific evidence on sitting on the floor.

Children often naturally gravitate to the floor.
Despite this, health professionals are increasingly advising that sitting on the floor helps to maintain the natural curvature of the spine and so helps people sit more upright and improve posture. It's also claimed that sitting on the floor helps to improve strength and flexibility and can help you avoid lower-back pain.

Spinal structure
Though there is limited research on floor sitting, there may be some truth to these claims. This is because the spinal structure shows an inward natural spine curvature at the lower back called lumbar lordosis. When sitting on the floor, the lumbar lordosis is relatively low, which is closer to our natural position and posture.
Sitting cross-legged could also bring about the natural and correct curvature both at the upper and lower back, effectively stabilising the lower back and pelvis region. But that said, certain sitting postures rotate the pelvis backwards and the lumbar lordosis is more flattened than it is when sitting on a chair, which can cause problems.