New mom and Self’s Most Inspiring Woman of 2008 Jennifer Lopez was on Good Morning America today talking twins and triathlon training.

About her triathlon plans, she had this to say: “It actually came up when I was about 8 months pregnant and I was beached like a whale. I was watching TV and I saw a triathlon and I said, ‘You know what? I think I could do that, that would be great for me to do. Maybe I’ll do it this year.’ ”

And seven months later, she’s ready to swim, bike and run in the Nautica Malibu Triathlon this Sept. 14—for charity, of course.