The ability to pace yourself is very important in any type of race, or even a big ride.
Obviously it’s super important during a triathlon or time trial, but it’s also important if you’re trying to set a PR at a gran fondo or century ride.
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How to learn to pace yourself?
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How to tell your pace?
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A power meter is a game changer!
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Also, track your perceived exertion.
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Also consider the type of terrain. Even at a sustainable power output, the terrain (and other factors like weather) will become a factor.
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Try it out.
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