Sydney's not afraid of a challenge, whether it's inhabiting complex characters or taking on opponents in a mixed martial arts ring. She's been leaving it all on the mat since high school.
"I started when I was 14 and did my first competition at 18," she told Marie Claire. "It was a grappling competition against all guys a weight category above me, and I got first place. Those guys were probably saying, 'Oh, we didn't want to hurt her,' but they were definitely trying. Everyone broke a sweat!"