Michael Phelps said he would probably swim another Olympic cycle if it wasn’t for the possibility of injury, particularly with his shoulders.

“If you could guarantee me that I would never get injured in four years, and I would never have any problems with my shoulders or anything like that in four years, I’d probably do it again because I had more fun this time around,” Phelps said in a social media video Friday. “But I don’t want to risk that and not be able to spend time with Booms [son Boomer] when he grows up and watch him and be a part of every single part of his life when he gets older and older. So I think that’s something, for me, that I will never put my body through. I won’t take that chance. I think my body is way more important and my family is way more important than going another four years to swim in one more Olympics.”

Phelps’ right shoulder was a particular issue in his comeback for the Rio Olympics. He received two cortisone shots in the months before the Games, leading coach Bob Bowman to say that Phelps was “75 percent” of what he was at the 2008 Beijing Games, according to Sports Illustrated.

(Phelps has said he didn’t compete at 100 percent in Beijing, given an October 2007 broken wrist that interrupted training.)

Phelps reiterated, repeatedly as usual, during the 70-minute video that he would not return to competitive swimming. He still swims recreationally “for peace of mind” and “meditation.”

What about retirement saddens him?

“Not having the chance to represent my country anymore is something bums me out,” Phelps said, particularly hearing the national anthem atop the medal stand.

Phelps has plenty to keep him busy. The most pressing is testifying at a congressional hearing looking at improving the flawed anti-doping system in Washington, D.C., on Tuesday.

“I have a lot to say,” Phelps said. “To have that opportunity to speak out about my true feelings. I’ve never really, truly been able to do it.”

He began outlining those words Friday and said he had until Sunday to finish a page or a page and a half to present to the subcommittee.

“There are too many people who are cheating, that’s the easiest way to say it,” Phelps said. “Look what happened at the [Rio] Olympics, all the athletes that tested positive that were still allowed to compete. I think that’s wrong, and I think it’s unfair. I think that’s something that needs to clean.”

In Rio, Phelps praised teammate Lilly King‘s criticisms of athletes competing who had previously served doping punishments (such as King’s breaststroke rival, Russian Yuliya Yefimova). Phelps doubts he has ever competed in a clean race.

“I think you’re going to probably see a lot of people speaking out more,” Phelps said in Rio, according to The Associated Press. “I think [King] is right, I think something needs to be done. It’s kind of sad today in sports in general, not just in swimming, there are people who are testing positive who are allowed back in the sport and multiple times. It kind of breaks what sport is meant to be and that’s what pisses me off.”

Phelps said Friday that he hopes to help “clean the sports up so we can get back to why we play sports.”

“I don’t think any athlete should ever have that feeling that somebody else is at an advantage of using a performance-enhancing drug to help them,” he said. “I had these massive dreams and goals of things I wanted to accomplish and achieve, and never were they because I thought I could take an easy way by cheating. I basically just worked as hard as I could and made sure that my body was as prepared as I could possibly make it for every single meet. So I was able to accomplish the goals and dreams that I had. That’s something that I’m going to Congress to talk about.”

Phelps also added in Friday’s video that he hopes another swimmer will come along and break his records, that he was recently knocked out of a poker tournament by his wife and he will be in Budapest for the world championships in July.

Just not as a competitor.

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