Lance Armstrong confessed to using performance-enhancing drugs in a taped interview with Oprah Winfrey, which aired Thursday on OWN.
"I made my decisions. They are my mistakes," said Armstrong.
After Armstrong won Haines City's Ironman race in May, he told News Channel 8 Florida had a winning effect on him.
"You know for me, it's cool to win, but even more importantly, it's great to be 41 years old, be fit, be healthy, be cancer free," said Armstrong. "I don't know, maybe Florida's good. The last time I won a triathlon was 22 years ago in Florida."
Armstrong told Winfrey this week that his good health wasn't his only advantage.
"I made my decisions and I made my mistakes and I'm sitting here today to say I'm sorry for that," said Armstrong.
The cancer survivor and cycling champion told Winfrey he could not have won seven consecutive Tour de France titles without all the drugs.
"All the fault and all the blame here falls on me," said Armstrong.
After the US Anti-Doping Agency released its investigation into Armstrong, his Tour de France titles were stripped. Then Wednesday, the International Olympic Committee asked him to return his bronze medal.
Armstrong told Winfrey he quit using performance-enhancing drugs in 2005. The second part of Armstrong's interview airs on OWN Friday night.