Somewhat related, kindergartners cannot sit upright all day and do not have the wrist strength to learn writing anymore. Many 5 year olds cannot grasp a pencil

Somewhat related, kindergartners cannot sit upright all day and do not have the wrist strength to learn writing anymore. Many 5 year olds cannot grasp a pencil with their thumb and forefingers. They hold it more like a three year old, in a full hand grasp. Also, by mid-day the children cannot sit up any longer and tend to slump over in the chairs, laying against the table. These are not sleep deprived teens, they're usually full of energy at that age. The teachers told us that the first few months of kinder include an exercise regimen of core and wrist strength building just so they can sit up and hold a pencil. For instance, one of the exercises is a modified "cat cow" position (familiar to yogis). Screen time is leading to more than attention differences, it appears it leads to physiological differences as well.