Wealth usually insulates the body from discomfort. The plan requires the heir to undergo a brutal physical training regimen designed by a former enemy (e.g., a discharged soldier or a betrayed trainer). This includes cold exposure, endurance running to failure, and martial arts where they are thrown repeatedly.
In fiction, this plan creates the ultimate anti-hero: a leader who has stared into the abyss of their own weakness, paid tribute with their own flesh, and emerged not happy, but competent . Heir-s Tribute Masochistic Transformation Plan ...