Fitness
W′ Balance
W′ balance models anaerobic work capacity spent above critical power during exercise, recharging during easier segments.
W′ balance (pronounced “W prime”) tracks how much anaerobic work capacity you have spent above critical power during an effort—like a finite battery above threshold. Depleting W′ forces you to slow even if average power looked fine early.
Intervals and surges recharge W′ during easier segments.
Common questions
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Do recreational athletes need W′ tracking?
Not mandatory—but understanding finite surge capacity explains why repeated sprints fade and why honest recovery intervals matter.
Related terms
Put W′ Balance into practice
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