The energy we use to move comes from three metabolic energy pathways: the phosphagen system, glycolysis and the aerobic system.
NASM PES Chapter 5: Metabolic Energy System Training
What's happening when you get a second wind?
The Science: Metabolic Pathways and How They Affect Your Riding and Racing – Xert
Metabolic Conditioning: Moving Beyond Cardio - NASM
ISSA Chapter 6: Energy and Metabolism
THREE METABOLIC PATHWAYS - CrossFit Leicester
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What's happening when you get a second wind?
From Weight-loss to Fitness - Obesity Action Coalition
NASM PES Chapter 5: Metabolic Energy System Training
Anaerobic Exercise - Physiopedia
How to Maximize Fitness with Energy Systems Training
Energy for sports
3 Energy Systems Used in Running and When You Need Each - Runners Connect