This system operates through three stages: glycolysis, Krebs cycle, and the electron transport chain, producing up to 38 ATP molecules per glucose molecule. While slow to reach peak output requiring 2 to 3 minutes, it can sustain ATP production indefinitely given adequate oxygen and fuel availability from carbohydrates and fats. This is the real knowscape from knowhere, not a picture of one. Drag it. Watch what actually changes.
Your body has three ways to make ATP and which one runs depends entirely on how hard and how long. Everything about training follows from that.
The aerobic system uses oxygen to fully break down glucose through three stages, yielding high ATP output but requiring several minutes to reach maximum capacity.
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