Kate Hudson knows a thing or two about working out: She even has her own athleisure empire in Fabletics. But as Cosmopolitan鈥榮 October cover girl (featured in a gorgeous 鈥70s-inspired bodysuit) revealed to the mag, her best workout hack came from a rather unexpected source.

The 38-year-old said it鈥檚 actually her newly shaved head that helps her sweat it out 鈥 literally. 鈥淐uts down on time spent post-sweat,鈥 she admitted.

While she didn鈥檛 get into the nitty-gritty deets about how she feels being part of Hollywood鈥檚 buzz-cut club, she did reveal the one person who helps her out if she ever feels insecure. That favorite advice-giver is none other than brother Oliver Hudson, whom the Deepwater Horizon actress regularly calls for some laughter therapy and encouragement. She shared his best words of advice with the mag, saying, 鈥溾楴obody cares! 鈥楾here鈥檚 about seven plus billion people in the world who don鈥檛 give a sh*t.鈥 Preach!

It鈥檚 that type of carefree attitude that led to some of her happiest moments in the last year, such as 鈥渨orking with Sia on our special project (Sisters) and knowing that no matter what, I will always have a lifelong friend in her,鈥 Hudson said. 鈥淲hat a beautiful person.鈥

What鈥檚 your post-sweat beauty hack? Tell us @BritandCo!

(Photo via Alberto E. Rodriguez/Getty)