Ask anybody if they'd like abs and chances are they'll jump (or should ... there are only so many HIIT circuits a girl can do before she starts to become deeply uninspired. I have always found ...

In one of the snaps, our girl is lounging on the beach with killer abs and arms—talk about impressive ... and lunges—among other moves. “We progress, add challenge, and mix things up ...

Not surprisingly, girl doesn't wear a lot of clothes—and with abs like those (see below) we don't blame her. On the other hand, it's tough for Katherine to find time to make it to all those ...