This is a very long way of saying: you should learn new skills, and practice the skills that you think will be valuable by the time you need to get a new job.
Practice isn't rocket science... heck, just practice different kinds of programming. You'll naturally improve at everything because it all relates to each other. To borrow from his football and music examples, even practicing dance will make you a better football player, and so will playing the drums for a cellist.
Practice isn't rocket science... heck, just practice different kinds of programming. You'll naturally improve at everything because it all relates to each other. To borrow from his football and music examples, even practicing dance will make you a better football player, and so will playing the drums for a cellist.