If he's a child who needs exercise to "channel frustrations" surely getting him involved in a running or other sports club is the way to go.
Bullying fathers intimidate, humiliate and frighten their children. As for the school reports of improved behaviour following the incident, any teachers will confirm that it isn't unknown for teachers to report a child is 'much better, responding better' to parents they fear will physically or emotionally punish children to excess.
People eating and drinking on the go