If you#39;ve picked up lt;a href=quot;http://www.coachvance.com/store/books/quot; target=quot;_blankquot;gt;Run With Powerlt;/agt;, or been listening to me on podcasts, you know that speed per watt is the key metric for running power meters, or what I call, Efficiency Index, or EI for short. Chapter 5 in the book is devoted to this topic entirely, and I discuss how a rolling 30 second average of your speed per watt in a race or workout can give you a good idea of how efficiently you#39;re running, or the speed you#39;re getting for the watts you#39;re producing.lt;br /gt;lt;br /gt;In this technology age, we can create these metrics to monitor during a run on our watches or head units, and I have a couple of fans of the book who created the Rolling EI for Garmin and Suunto users. The Suunto apps were created by Toni Cumplido, (twitter: lt;a href=quot;https://twitter.com/tonicumpliquot; target=quot;_blankquot;gt;@tonicumplilt;/agt;), so thank you Toni for these! I hope to have more Garmin IQ apps coming.lt;br /gt;lt;br /gt;Here are the links for each, if you#39;re using these products and want to see...lt;br /gt;lt;br /gt;lt;ugt;lt;bgt;Efficiency Index by itself, of the entire sessionlt;/bgt;lt;/ugt;lt;br /gt;Garmin IQ Applt;br /gt;lt;a href=quot;https://apps.garmin.com/en-US/apps/0e5487bc-c147-48dc-8fbd-81d2caacc780quot;gt;https://apps.garmin.com/en-US/apps/0e5487bc-c147-48dc-8fbd-81d2caacc780lt;/agt;lt;br /gt;lt;br /gt;Suunto Moves Count App for Ambitlt;br /gt;lt;a href=quot;http://www.movescount.com/apps/app10924730-Efficiency_Index_(w)quot;gt;http://www.movescount.com/apps/app10924730-Efficiency_Index_(w)lt;/agt;lt;br /gt;lt;br /gt;lt;ugt;lt;bgt;lt;br /gt;lt;/bgt;lt;/ugt;lt;ugt;lt;bgt;Rolling Efficiency Index, just the previous 30 seconds within the sessionlt;/bgt;lt;/ugt;lt;br /gt;Suunto Moves Count App for Ambitlt;br /gt;lt;a href=quot;http://www.movescount.com/apps/app10917000-Rolling_Efficiency_Index_(w)quot;gt;http://www.movescount.com/apps/app10917000-Rolling_Efficiency_Index_(w)lt;/agt;lt;br /gt;lt;br /gt;lt;br /gt;lt;ugt;lt;bgt;Power Training Zoneslt;/bgt;lt;/ugt;lt;br /gt;Suunto Moves Count App for Ambit - Allows you to see what zone you are in while training, based on your rFTPw.lt;br /gt;lt;a href=quot;http://www.movescount.com/apps/app10917280-Training_Zonequot;gt;http://www.movescount.com/apps/app10917280-Training_Zonelt;/agt;lt;br /gt;lt;br /gt;Again, thanks for the help, and I hope you#39;re enjoying lt;a href=quot;http://www.coachvance.com/store/books/quot; target=quot;_blankquot;gt;Run With Powerlt;/agt;, and these metrics for training.lt;br /gt;lt;br /gt;Coach Vance