‘It’s OK not to be OK’. For decades, they were told to shake it off or toughen up — to set aside the doubt, or the demons, and focus on the task at hand: winning. Dominating. Getting it done.

For years, Simone Biles was one of the very best at that. Suddenly — to some, shockingly — she decided she wasn’t in the right headspace.

By pulling on her white sweatsuit in the middle of Tuesday night’s Olympic gymnastics meet, and by doing it with a gold medal hanging in the balance, Biles might very well have redefined the mental health discussion that’s been coursing through sports for the past year.

Michael Phelps, winner of a record 23 gold medals and now retired has long been open about his own mental health struggles. Phelps has said he contemplated suicide after the 2012 Olympics while wracked with depression. Now an analyst for NBC’s swimming coverage, he said watching Biles struggle “broke my heart.”

“Mental health over the last 18 months is something people are talking about,” Phelps said. “We’re human beings. Nobody is perfect. So yes, it is OK not to be OK.” Biles joins some other high-profile athletes in the Olympic space — overwhelmingly females — who have been talking about a topic that has been taboo in sports for seemingly forever.

 Tennis player Naomi Osaka withdrew from the French Open, never went to Wimbledon and, after her early exit in Tokyo this week, conceded that the Olympic cauldron was a bit too much to handle.

— American sprinter Sha’Carri Richardson made no secret of the issues she faced as she prepared for an Olympic journey that never happened. She said she used marijuana to help mask the pain of her birth mother’s death, to say nothing of the pressure of the 100 meters.

— Dutch cyclist Tom Dumoulin left training camp in January to clear his head, saying he was finding it “very difficult for me to know how to find my way as Tom Dumoulin the cyclist.” He resumed training in May; on Wednesday, he won a silver medal in the men’s individual time trials.

Biles, though, took things to a new level — one that now makes it thinkable to do what had been almost unthinkable only 24 hours before. She stepped back, assessed the situation, and realized it would not be healthy to keep going.

On Wednesday, she pulled out of the all-around competition to focus on her mental well-being.

“I have to do what’s right for me and focus on my mental health, and not jeopardize my health and well-being,” a tearful Biles said after the Americans won the silver medal in team competition. She said she recognized she was not in the right headspace hours before the competition began.

“It was like fighting all those demons,” she said.

The International Olympic Committee, aware of the struggles young athletes face, increased its mental health resources ahead of the Tokyo Games. Psychologists and psychiatrists are onsite in the Olympic village and established a “Mentally Fit Helpline” as a confidential health support service available before, during and for three months after the Games.

The 24-hour hotline is a free service that offers in more than 70 languages clinical support, structured short-term counseling, practical support and, if needed, guidance to the appropriate IOC reporting mechanisms in the case of harassment and/or abuse.

(With AP inputs)