Allyson Felix had no problems advancing out of the 400-meter prelims on Monday.

The 35-year-old handled her heat with ease, crossing the finish line in a time of 50.84. That time was good for third-best in the prelims.

Felix is no stranger to the event, having won silver in 2016 at the Rio Games. The time is also just off of her Olympic Trials time from back in June, where she qualified for the Olympics with a time of 50.02 seconds.

Prior to her race, she released a letter to her daughter, Cammy.

“I had you after four Olympic games, six gold medals, three silver,” she said. “Yet my greatest accomplishment is you.”

“Do you know what they said after I had you?” she continued. “They said I’d retire, that I was too old to complete, that I couldn’t get my body back in shape, but Cammy, here I am to prove them wrong.”

Felix has an opportunity to do just that and advance to the 400-meter finals set to take place on Friday.