"I feel fierce," 32-year-old Ferrera told ET's Kevin Frazier. "I just did a triathlon. What's there not to feel fierce about? I feel strong and healthy and that's what feels great."
"I did it all by myself," she continued. "I finished, which was my only goal. It was my first triathlon."
Ferrera, who said she trained for five months to compete in the Nautica Malibu Triathlon on Saturday, also shared some advice for anyone thinking of participating in a big sporting event.
"If I can do it, you can do it," she explained enthusiastically. "It wasn't just about the physical part, it’s what it takes mentally and spiritually to commit. So, get out there and face your fears. I had never been a swimmer and you have to swim in the ocean, which is like a big thing for a lot of people."