Why Have I Plateaued in Training?

A plateau is not the same as a ceiling

A ceiling is genuine: you are near your potential for the training you are doing, and progress requires more or different training.

A plateau is different: the stimulus is adequate and the response is not arriving. That is worth investigating rather than answering with more volume.

The distinguishing question: are you plateaued, or are you plateaued and feeling worse? Flat progress with good energy is often a programming issue. Flat progress alongside poor recovery, disturbed sleep or heavier legs is a different conversation.

What limits adaptation

Endurance adaptation means building mitochondria, growing capillaries, and increasing enzyme concentrations. All three consume minerals.

• Iron for oxygen transport and mitochondrial enzymes
• Magnesium, manganese, selenium and copper sitting in the electron transport chain
• Zinc for protein synthesis

Heavy metals matter here too. They compete with essential minerals for the same absorption and transport pathways, so a meaningful burden can leave you functionally deficient with genuinely good intake.

Programming reasons first

Before assuming a physiological limit:

• Too much intensity, not enough easy. The most common error in endurance training.
• No progressive overload. Same sessions, same paces, for months.
• Insufficient fuelling for the work being asked.
• Life stress, which the body does not distinguish from training stress.
• Not enough time. Adaptation is slower than most training plans assume.

A good coach solves more plateaus than a good supplement does. That is worth saying plainly.