Before her role of Batgirl on the Batman TV show, Yvonne Craig was known as a talented dancer. She joined the "Ballet Russe de Monte Carlo" as its youngest corps de ballet member. This training was helpful when she performed stunts while playing Batgirl, specially while filming fight scenes. She also owned a motorcycle, something uncommon for a girl in the 1960s, so she did ride the Batgirl cycle effortlessly.
And that was a good thing, because Batgirl's original stunt double (showed in the second picture of this post) didn't look anything like her!
That's all for now. See you again tomorrow! Same Bat-Time! Same Bat-Channel!