Feel the burn! No one can escape Jane Fonda's classic workout videos — not even Portia de Rossi. Ellen DeGeneres secretly filmed her wife sweating it out to one of the actresses' legendary tapes recently, and shared the video with her millions of fans.

".@PortiadeRossi said I could watch her do her @JaneFonda workout," DeGeneres, 56, tweeted on Saturday, Jan. 3. "She didn't say anything about filming & tweeting it."

The Arrested Development actress, 41, slipped into comfy sweats while exercising and kept her blonde locks pulled back and away from her face. "Come on, this is hard!" she called out to DeGeneres behind her.

One month earlier, Fonda herself talked about her workout videos when she stopped by The Ellen DeGeneres Show on Dec. 15. "It launched the video industry and launched woman being okay with muscles," she said. "Back then if a woman went to a health club there would be a gym for men and nothing for women. We were not supposed to be strong and fit."

The Oscar winner, now 77, released her first exercise video (and showed off her fab '80s gear!) in 1982. She's since made two dozen more, including five between 2010 and 2012.

Watch the videos above now, and see Fonda's reaction to de Rossi's moves!