In the two-man bob what is the purpose of the second person (i.e. the one hiding at the back who's not steering)?

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@spacemagick I believe their main purpose is to provide a fast powerful start to the run as they tend to be former Olympic sprinters
@Wigwam12 @spacemagick Also, providing extra mass for downhil acceleration, not to mention working the brakes.
@shelldozer @Wigwam12
Ah, breaks, that makes sense!
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