The "Cake" star said perspiration is a great tool for styling your locks, reported Us magazine.
When asked if she washes her hair after workouts, she said, "No, I don't. I actually don't. A little sweat in the hair is nice. It's like a little product. You just blow it out with your fingers and it's actually just fun."
The 46-year-old actress said she only washes her hair every two or three days thanks to a shampooing product which contains no silicone.
"Silicone is a culprit in most shampoos. Over time, it builds up and turns into a hard coating and it cracks and breaks and snaps your hair.