08/03/2011 at 12:25 PM EDT
How is Mariah Carey
getting back in shape following the birth of her twins
in April? She's working out – at the beach!
"I'm getting it in," she tells PEOPLE with a laugh of her exercise routine. "Ocean work out!" the singer Tweeted on Tuesday
to accompany the photo of her splashing in the waves. "It's been a loooong time since I've been in the ocean."
And she's got a little girl who would probably like to join her. "My daughter Monroe loves the water more than me if that's possible," adds Carey.
The mom of two has also been taking long walks with her five Jack Russell terriers – Cha Cha, Jackie Lambchops, Jill E. Beans, Squeak E. Beans and JJ – and she even made a trip to Florida for a workout-heavy vacation.
And while the visor and sunglasses might make it tough to swim, Carey says she knows what she's doing
when it comes to aquatic exercising.
Water aerobics has long been one of her favorite activities, and it's "actually three times more effective" than other workouts, she has said.
Splash on, Mimi!