WHY THIS HAPPENS
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Riding above VT1 — what feels moderate is actually zone 3-4
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Aerobic base underdeveloped — insufficient mitochondrial density
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Zone miscalibration — zones set too high, making 'easy' rides too hard
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Shallow breathing pattern — chest breathing instead of diaphragmatic
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Position-related — aggressive aero position compressing the diaphragm
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Asthma or exercise-induced bronchoconstriction (common, under-diagnosed)