Why are horse jockeys so small?

Revelational-Heaven
Why are horse jockeys so small?
Horse jockeys seem to be very small. You never see any of them that have a little bit of weight or height to them.

What is the most likely reason to this? Do you have any idea?
So the horse can run faster
Vote A
Because smaller jockeys fit the horse better
Vote B
Select age and gender to cast your vote:
GirlGuy
Why are horse jockeys so small?
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