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. 14â€"for charity, of course.