In the last newsletter, I introduced first principles thinking - breaking something down into its most fundamental elements to better...

This post was originally about the details of physiological testing. Along the way, I stepped back towards a more fundamental concept —...

Until now, this blog series has explored the pillars of endurance performance—ranging from Joyner and Coyle’s  broad analysis of...

First, what does the calculator do? 1- provides a cheap (free!) method to control your training intensity 2- uses scientifically sound...