“…As we are living in the 21st century and people are using a smartphone for their convenience. First, we need to define different sitting postures as discussed in previous literature, such as forward position, middle position, or backward position, forward sitting posture, reclined sitting posture, slumped sitting posture, laterally tilted left or right sitting posture, arm back leaning, right over left, twist left, poking chin, arm learning, crossed legs right over left or left over right sitting posture and postures in school children [ 18 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. The proposed study covered five different sitting postures, which are illustrated in Figure 1 .…”