Charlize Theron is back on the big screen and looking sexier than ever in Young Adult! The 36-year-old Golden Globe nominee works hard to keep her body looking toned and taut – and Shape magazine has unveiled the secret to her stay-fit success!

Charlize has been training with fitness expert Fedele De Santis, who owns The Gym on Nemo, for more than two years and the celebrity trainer dishes to Shape about how she keeps her beautiful ballerina shape.

“Charlize is an extremely serious, focused, professional, no BS, balls-to-the-wall client,” De Santis says, who also works with Jessica Biel, Cameron Diaz and Eva Mendes, about the South African stunner.
“She is so tenacious — my nickname for her is thundercat!”