Anaerobic energy is generated only with glucose (a simple sugar), and it’s quicker and easier for our bodies to access. It’s a kind of backup system and turbo boost when the body doesn’t have enough oxygen.3 But anaerobic energy is inefficient and can be toxic, creating an excess of lactic acid.4 The nausea, muscle weakness, and sweating you experience after you’ve pushed it too hard at the gym is the feeling of anaerobic overload.5 This process explains why the first few minutes of an intense workout are often so miserable. Our lungs and respiratory system haven’t caught up to supply the
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