According to Jim (2001)

S6E1 The Punch

Jim comes to the conclusion that Cheryl has been overly indulgent with their son Kyle, prompting him to teach Kyle how to throw a proper punch for self-defense. Jim's intentions backfire when Kyle, empowered by his new skills, ends up suspended for repeatedly confronting the school bully. What starts as a father-son bonding experience spirals into a chaotic situation that both Jim and Cheryl must address.