We learned last month that Jennifer Lopez was training for a triathlon, and now she's sharing more details with Self magazine. As a matter of fact, the diva herself invited Self editor-in-chief Lucy Danziger to come out and train with her and her trainer, Gunnar Peterson.

Lopez is participating in the Nautica Malibu Triathlon on September 14 and is using the race to raise money for Children's Hospital Los Angeles. The race starts with a half mile ocean swim, goes on to an 18 mile out and back bike ride, and ends with a four mile run. And the new mom is ready, spending an hour and a half each day working out in her home gym.

She said she decided to do a triathlon after watching one on TV while eight months pregnant, and credits her high school track background with her "Can do!" attitude. She told Self, "The team was a big part of my life back then and taught me so many things. When I look back on my life and what I'm able to do, it's partly because of that early training. It taught me discipline, how to be committed, about striving to win, stamina, all that good stuff."

Check out the video above to see part of the workout (and Lopez's flat and fabulous abs). And, if you're interested in supporting her cause, you can donate here.