Zuzana «Zuzka» Light (born April 29, 1982; née Majorová), is an internationally known fitness instructor, model, businesswoman, and author. She was born in Czechoslovakia and currently resides in Los Angeles, California.
Light runs one of the most popular online fitness instruction channels on YouTube, and her videos have been viewed over half a billion times. Prior to starting her current YouTube channel, Light co-founded the fitness website and YouTube channel «BodyRock.tv» with then-husband Frederick Light. The couple split in 2011, and divorced in 2013.
Before moving to North America, Light worked as a model and a softcore pornographic model under the name «Susana Spears». She described the experience as «an incredibly humiliating situation», and said she felt lucky to have survived the experience, and that «working on fitness helped me heal emotionally and rebuild my sense of self worth.»