Jennifer Lopez says she keeps in shape while she's touring because she doesn't want to "cheat an audience" out of an energetic show.
The singer, who is currently on the road with Enrique Iglesias, exercises and keeps fit in order to always impress on stage.
"When I decided to do this I really thought to myself, 'OK, I've got to get on a really great schedule'," she told Extra.
"I gotta eat right, I gotta feel good, because you really want to feel good, you want your energy to be good. You don't want to cheat an audience one day because you're too tired or whatever.
"It's about working out, it's about eating right, it's about getting a massage and feeling rested and relaxed and ready to go."
Iglesias has revealed what he gets up to when he attends the gym with friends.
"We were in Toronto, we were in the gym and he told me. 'Man your work-out is you walk around and look at the machines'," he laughed.
"It's boring, there's nothing more boring than going to a gym."