Anaerobic exercise involves short, intense bursts of activity where your body's demand for oxygen exceeds the available supply.
Unlike aerobic exercise (Zone 2), which uses oxygen to burn fat and sugar, anaerobic exercise relies on energy sources stored in your muscles, like glucose, through a process called glycolysis
Key Characteristics
- Intensity
- Duration
- Examples
- Sprinting, heavy weightlifting, jumping rope, and the “work” intervals of a HIIT session.
Impact on Metabolic Health
- Muscle Mass & Insulin
- High-intensity resistance training builds lean muscle, which acts as a “glucose sink,” helping your body clear sugar from the blood more effectively
- EPOC (Afterburn Effect)
- Anaerobic workouts create an “oxygen debt” (Excess Post-exercise Oxygen Consumption), causing your body to burn more calories for hours after the workout as it works to recover
- Hormonal Response
- It triggers the release of growth hormone and testosterone, which are vital for fat loss and maintaining a healthy metabolism as you age