Sports are back and professional athletes have turned to social justice activism during the national anthem to raise awareness on racial injustice and police brutality in the U.S.

The movement started in 2016 when Colin Kaepernick, of the NFL’s San Francisco 49ers, started to kneel during the anthem after talking to former U.S. Green Beret, and former Seattle Seahawks player, Nate Boyer. The decision to kneel started a firestorm across the league and even reached the upper echelon of the White House.

While kneeling during the anthem was primarily centered in the NFL, several athletes followed Kaepernick's path – Megan Rapinoe in the National Women’s Soccer League and Bruce Maxwell in Major League Baseball. Scores of NFL players would also kneel during the anthem in 2017.

But as games were played and championships were won, the fever pitch around kneeling during the national anthem began to taper off – until the summer of 2020.

In the wake of the death of George Floyd – who died in a police-involved incident in late May – players from all professional sports leagues planned protests during the national anthem.

While most players have knelt during the national anthem, there was a handful of them who did not. Those players cited religion or equated kneeling with disrespecting the American flag or the military among other reasons.

Players and coaches who didn’t kneel for the anthem explained their reasoning for the most part.

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BRENT BARNAKY, NBA: Even NBA referees were a part of the protests during the national anthem to begin the league’s restarted season. But while they knelt in protest during the first few games, Barnaky refused to kneel for “The Star-Spangled Banner.” He explained his reasoning in a statement to ESPN.

“I fully support the social justice movement and everyone who chooses to kneel as a means of peaceful protest. For me personally, it is important I stand for our national anthem, which is what I chose to do this evening. I believe you can be committed to both ideas and I will continue to support the league’s social justice efforts to help bring equality to this country.”

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GREGG POPOVICH, NBA: The San Antonio Spurs coach and assistant Becky Hammon stood for the anthem despite Popovich’s longstanding support of social justice initiatives.

“I'd prefer to keep that to myself,” Popovich said when asked about his reasoning, according to USA Today.

“Everybody has to make a personal decision. The league's been great about that; everybody has the freedom to react any way they want. For whatever reasons that I have, I reacted the way I wanted to.”

Popovich is a graduate of the U.S. Air Force.

San Antonio Spurs head coach Gregg Popovich, fourth from left, stands while wearing a mask while Sacramento Kings head coach Luke Walton, center, kneels with players before an NBA basketball game Friday, July 31, 2020, in Lake Buena Vista, Fla. (Kim Klement/Pool Photo via AP)

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JONATHAN ISAAC, NBA: Jonathan Isaac was the first player to stand for the national anthem in the NBA, which prides itself on being on the frontlines of social justice. Austin stood for the anthem without a Black Lives Matter shirt before his Orlando Magic took on the Brooklyn Nets.

Isaac explained why he didn’t kneel or wear a shirt supporting the movement, according to Bleacher Report.

“I believe that Black Lives Matter. A lot went into my decision, and part of it is, I thought that kneeling or wearing the Black Lives Matter t-shirt doesn't go hand-in-hand with supporting Black lives. So I felt like, just me personally, what is that I believe is taking on a stance that, I do believe that Black lives matter, but I just felt like it was a decision that I had to make, and I didn't feel like putting that shirt on and kneeling went hand in hand with supporting Black lives. I believe that for myself, my life has been supported by gospel, Jesus Christ, and everyone is made in the image of God and that we all forge through God's glory.

“Each and every one of us do things that we shouldn't do and say things that we shouldn't say. We hate and dislike things that we shouldn't hate and dislike, and sometimes it gets to a point where we point fingers, whose evil is worse, and sometimes it comes down to whose evil is most visible. So I felt like I wanted to take a stand on, we all make mistakes, but I think that the gospel of Jesus Christ is that there's grace for us, and that Jesus came and died for our sins and that if we all come to an understanding of that and that God wants to have a relationship with us, that we can get kept all of the things in our world that our messed up, jacked up.

“I think when you look around, racism isn't the only thing that plagues our society, that plagues our nation, that plagues our world, and I think coming together on that message that we want to get past not only racism but everything that plagues as us as a society, I feel like the answer to that is gospel.”

Orlando Magic's Jonathan Isaac (1) stands as others kneel before the start of an NBA basketball game between the Brooklyn Nets and the Orlando Magic Friday, July 31, 2020, in Lake Buena Vista, Fla. (AP Photo/Ashley Landis, Pool)

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MEYERS LEONARD, NBA: Meyers Leonard, of the Miami Heat, chose to stand for the national anthem as well during the league’s first games of the restarted season. Leonard said he believes “Black lives matter” but went further in his explanation to reporters after the game.

“Some of the conversations I’ve had over the past three days, quite literally, have been the most difficult,” he said. “I am with the Black Lives Matter movement and I love and support the military and my brother and the people who have fought to defend our rights in this country.

Leonard decried the racial division currently gripping the country and said he finds it troubling that certain people now choose to deal in moral absolutes.

“I am a compassionate human being and I truly love all people,” he explained. “I can’t fully comprehend how our world, literally and figuratively, has turned into Black and white. There’s a line in the sand, so to speak: ‘If you’re not kneeling, you’re not with us.’ And that’s not true."

He added: “I live my life to serve and impact others in a positive way.”

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RACHEL HILL, NWSL: Rachel Hill, of the Chicago Red Stars, stood by her teammates Casey Short and Julie Ertz while they embraced while kneeling during the anthem. Hill said she stood for the anthem because of her family’s military history.

“I chose to stand because of what the flag inherently means to my military family members and me, but I 100% percent support my peers. Symbolically, I tried to show this with the placement of my hand on Casey’s shoulder and bowing my head. I struggled, but felt that these actions showed my truth, and in the end I wanted to remain true to myself,” Hill said in a statement posted on Twitter.

“If this wasn’t clear, let my words and further actions be. I support the black lives matter movement wholeheartedly. I also support and will do my part in fighting against the current inequality. As a white athlete, it is way past due for me to be diligently anti-racist.”

Chicago Red Stars' Julie Ertz, second from left, holds Casey Short, center, while other players for the team kneel during the national anthem before an NWSL Challenge Cup soccer match against the Washington Spirit at Zions Bank Stadium, Saturday, June 27, 2020, in Herriman, Utah. (AP Photo/Rick Bowmer)

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SAMANTHA MURPHY, NWSL: Samantha Murphy, of the North Carolina Courage, also stood for the anthem on the sideline before one of her first matches. Murphy was wearing a Black Lives Matter T-shirt but didn’t explain her reasoning for standing for the anthem. Murphy, also known as Samantha Leshnak, reportedly did take a knee in solidarity with other players while the public address announcer at Zions Bank Stadium read a statement to honor victims of racial injustice.

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SAM COONROD, MLB: Players from the New York Yankees and Washington Nationals knelt for their first game and most of the players from the San Francisco Giants and Los Angeles Dodgers – except for Giants pitcher Sam Coonrod. He was the only player to stand ahead of their game.

“I’m a Christian," he said, according to TMZ Sports. “So I just believe that I can’t kneel before anything besides God.”

Aside from his religious beliefs, the 27-year-old relief pitcher said there are aspects of the movement that he disagrees with.

“I just can’t get on board with a couple things I’ve read about Black Lives Matter, how they lean towards Marxism,” he continued. “And … they said some negative things about the nuclear family. I just can’t get on board with that.”

Most members of the San Francisco Giants kneel during a moment of silence prior to an opening day baseball game against the Los Angeles Dodgers, Thursday, July 23, 2020, in Los Angeles. (AP Photo/Mark J. Terrill)

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STEPHON TUITT, NFL: While NFL players are expected to kneel during the national anthem at the start of the 2020 season, the Pittsburgh Steelers defensive end has said he plans to stand for “The Star-Spangled Banner.” He said multiple times in July that he had no plans to kneel for the anthem.

“Also I’m not kneeling for the flag and screw anybody who have a problem with that,” Tuitt wrote on Twitter on July 27. “My grandmother was a immigrant from the Carribean and ... worked her ass off to bring 20 people over the right way. She had no money and educated herself to be a nurse. She living good now.”

He added on July 31: “I stand for the flag because I am a proud American. Like previously stated, this country has provided and rewarded my family in so many ways through our perseverance and hard work. I will continue to honor my country and be an example to my children to stand for what they believe in. In regards to police brutality and the black lives matter movement I will support these causes through other means. It’s unfortunate that a couple unprofessional individuals have caused such havoc on our country and damaged the trust of its citizens. I will not let those individuals steer me from the fact on the opportunity this country gives for everyone. God Bless.”