How did he keep so fit when he led such an indolent life?

It was her that invited me to play for a keep fit class.

As well as helping you to keep fit physically, there are also mental benefits.

Never ever stops me pounding out the miles to keep fit either.

Contrary to popular belief, aerobic exercise does not necessarily mean jumping around in your local keep fit class for an hour.

Girls were spared military training, but were forced to keep very fit in order to produce healthy sons.

Well, well, keeping quite fit, and all that?

But the men - and women - must be kept fit if the Marines are to maintain their reputation as the toughest of the tough.

The 18-year-old student at Ballycastle High School is a keen swimmer and keep fit fanatic.

She began cycling to keep fit away from the pool following an ear infection in 2005.