CHART: Zones. Thresholds. Energy Systems. Fuel Systems.

As requested, here is the full version of the chart I referenced in the article on aerobic capacity. A similar version was created when developing the curriculum for Cycling Fusion’s Level 2 Heart Zones Certification workshop. I have since modified the chart to overlay the zones and indicate the thresholds’ aliases.

I look forward to your comments.


  1. It’s going to be everyone’s take home goodie this morning!

  2. This is fantastic! Thank you so much! It really makes it easy to see and clear about the process.

  3. Thanks Tom going into my slides for tomorrows class.

  4. Tom, I love this. Thank you. The flags and colors provide a great visual and a clear understanding of the gradual transition of the body through the zones. Since this is member only content are we free to reproduce this chart and post it in our cycling rooms?

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