What did Musonius Rufus teach about training (askesis)?

Musonius Rufus's Lecture VI, traditionally titled "On Training," is the fullest surviving ancient treatment of askesis - disciplined practice aimed at building virtue rather than merely learning about it. His starting premise is that a human being is a composite of body and soul, and both require training, though not equally: "since it so happens that the human being is not soul alone, nor body alone, but a kind of synthesis of the two, the person in training must take care of both, the better part, the soul, more zealously, as is fitting, but also of the other, if he shall not be found lacking in any part that constitutes man" (trans. Cora E. Lutz). Musonius argues that just as an athlete strengthens the body through repeated exertion under a coach's direction, the soul is strengthened by deliberately choosing hardship - enduring cold, hunger, or discomfort on purpose - and by practicing self-control through voluntarily abstaining from certain pleasures, not because pleasure itself is evil, but because the capacity to refuse it needs exercise like any other capacity. He is careful to frame the goal as strengthening, not self-punishment: the point of training is to make virtue reliable under real pressure, since knowing that courage or temperance is good does nothing for someone who has never practiced acting on that knowledge when it costs something. This is why Musonius insists philosophical training must combine both bodily and mental exercises rather than treating Stoicism as a purely intellectual position - a person who can recite the theory of virtue but has never practiced enduring discomfort, he argues, is unlikely to hold up when circumstances actually test them. The lecture had direct influence on his student Epictetus, whose own emphasis on daily practice and self-examination builds on this same premise that virtue is a trained skill.