Riders always mount their horses from the left. The custom began centuries ago when men carried
swords. Since most men are right-handed, the sword was usually carried on the left hip to make it
more accessible to the right hand. With a long sword hanging from a rider's left side, it was clearly
easier for him to mount his horse by putting his left foot into the stirrup (abumi in Japanese) and then
hrowing his right leg across the horse's back. Even after riders no longer carried swords, mounting
from the left remained the custom.
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