Lin Wanwan's clan school doesn't hold main classes all day; usually, there are literary classes in the morning and physical labor classes in the afternoon.
Lin Wanwan specifically learned military exercises from modern times to teach the children, although she often lets them do labor for the clan as well, like cleaning, weeding, or catching insects; either way, it all counts as physical training.
Children in Great Tang Village could not possibly be as lazy or unknowledgeable about agriculture as modern children.
Lin Wanwan wanted to create a Peach Blossom Spring, not a valley of laziness.
The weather was gradually getting colder, and Lin Wanwan looked at the sky, thinking it might rain tomorrow. In fact, she had another worry; she was afraid a typhoon was coming.
The sky had been exceptionally beautiful these past few days, much like the phenomenon before a typhoon arrives.