WHY THIS HAPPENS
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Repeated-sprint ability (RSA) below group average — you can't absorb surges
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Anaerobic capacity (W') too small to bridge gaps when the group accelerates
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Poor positioning — burning watts fighting the wind instead of drafting
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Pacing on climbs — going into the red too early, dropping off the back on the second half
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Nutrition timing — 90 min in with no carbs is the classic drop zone
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Aerobic base insufficient for the duration of the ride
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Bike position or equipment inefficiency — 20+ watts lost to drag or rolling resistance