After about eight weeks of running, you should be able to start adding in higher intensity efforts to help you race better, ...

Unlike a training matrix, which identifies mandatory courses for employees (such as ISO 45001 training for a company pursuing certification), a skill matrix measures practical competence.

That may sound a bit like the plot to the 1999 sci-fi film "The Matrix", said Scientific American, but "philosophers, physicists, technologists and, yes, comedians" have been wrestling with the ...