…sh themselves like this, but from my experience and the experience of many athletes I’ve spoken to, extreme fitness is less about being young again and more about building yourself up for the years ahead. In other words, getting better at getting older.
…empowered to add tests to your application that ensure the major invariants of your infrastructure. Tests are not only for testing that your math functions do the right thing. They are also for infrastructure and for the major design features of your application.