Resource - The Energy Continuum: Covers aspects such as Thresholds, OBLA and the relative contribution of each energy system to ATP resynthasis.
Resource - PC Energy system: This covers the key aspects of the PC energy system. The +/- aspects of the system. And an activity which works well with my students.
Resource - Aerobic Energy System: This covers aspects such as the +/- of the system and also highlights the system through a diagram.
Resource - ATP: An introduction to ATP and the concept of energy.