The idea must be poisoned before the activity itself can become toxic. It is precisely the misunderstanding of what the term "fitness" means that leads many away from the true, original concept and towards the quick fix, the momentary, and ultimately, the detrimental. Michael and Kegan kick off by discussing the common practice of sacrificing health for wealth, and later trying to use the wealth to u****k what was done to earn it. The youthful notion of invincibility makes all manner of physical damage acceptable if the result is wealth or notoriety but/and "athletic longevity" doesn't make sense to someone who can't yet define actual longevity for themselves. Once physical condition or performance begins to decline (through overuse, injury or simple aging) repeating what was done a decade or more prior can be very seductive but the training that got one to a peak won't reproduce that peak after one is moving down the back-slope of that peak; none of us are 20 years old any more. At some point it is important to know and understand when to quit ... without becoming a quitter.Michael admits, "when I was younger I had to prove I wasn't lazy but as I get older I want to prove I'm not stupid. I know I don't avoid hard things, I've proven it to myself, which means it's time to learn how to take care of myself." He and Kegan observe that childhood/adolescent programming affects behavior decades later, and that maintaining a relationship with physical activity can stall or counter age-related cognitive decline; vigor in the body directly supports vitality in the mind. Understanding the true and real "how" of fitness has become more important in this era where everything has a hack or shortcut, and physical appearance often belies serious, underlying health issues.