Ayre trained for the 2004 Athens Games, but a hamstring injury prevented him from competing.
The 2008 Olympic Games in Beijing brought "great expectations" for Ayre and his Jamaican teammates. He planned to compete in the 400 meters and the 4x400-meter relay, where the Jamaicans were expected to medal.
But Ayre was eliminated in the first round of the 400 meters' competition, and the 4x400-meter relay team finished eighth in the finals.
Despite the disappointment, Ayre said Beijing was the best Olympics he attended, with performances by Michael Phelps, and the excitement surrounding fellow Jamaican Usain Bolt bringing track and field back into the spotlight.
"It was an overwhelming spectacle, but it was a disappointment for me," he said. "I felt like I failed because I didn't come home with a medal."
Ayre trained for the 2012 London Games, but failed to make the team at the Jamaican trials. He retired shortly after that.
Ayre said he retired with no regrets, accomplishing all of the goals he had set for himself.
As a personal trainer, he can remain in the world of fitness and work to inspire his clients.
"Once I retired, I knew that this is what I wanted to do," Ayre said.
Ayre's personal training website can be found at mymvpfitness.com.