A curriculum for gym?
LOL Talk about micromanagement.
Overstepped his authority?
Bit dramatic? It is called improvisation. Sometimes a gym teacher will just try something new. Physical activity is physical activity.
You have made a mountain out of a molehill and are missing the forest for the trees.
Besides parental notes are necessary for all activities that occur outside of normal school hours and because the activity has a potential for physical harm. I see no reason for a parental consent for this activity.
Bookmarks