Olympic stars Lisa Buckwitz and Janine Flock bared all before heading to Beijing ... by posing nude for Playboy to promote body positivity!!
Buckwitz -- a gold medalist for Germany in the 2018 Winter Olympics -- wore only an open green top and black heels in her cover shoot for the popular mag's Germany edition.
Flock -- a 10-time world champ from Austria -- sat nekkid in a chair draped in a fur blanket for her cover.
27-year-old Buckwitz said she jumped at the opportunity to be photographed in the buff to encourage women to maintain a positive perception of their body.
"Every woman can be naked and nobody should be ashamed of her body," Lisa told the Sun. "For example, I have a few more muscles -- so what? I wanted to show that this is also a woman's body."
She added ... "I don't have to hide as a competitive athlete. No woman has to hide."
Much like Buckwitz, Flock said the motivation for doing the shoot was her desire to remind women to be proud of their bodies.
"I haven't had any cosmetic surgeries and I stand by what I have," Flock told the outlet. "Every woman can be proud of her body."
"It's important to have things other than a sport on your mind every now and then, I think it could even give me an extra motivation boost."