IN Jane Fonda's first two workout tapes for children, youngsters jump up and down, slither and rock and roll to percussive music not unlike the rhythms of rap.

Jagger was preposterous and admirable: these days, he always seems like he's filming a workout tape.

So Linta phoned San Francisco's tight ends coach, Tom Batta, and urged him to view the workout tape, which the 49ers had not yet seen.

Though some trainers recommend investing in an aerobic workout tape or a treadmill, stationary bike or elliptical machine for cardiovascular exercise, ingenuity can often take the place of technology.

And a discreet sliding glass door closes off the compact aerobics studio when guests stretch to one of the workout tapes that can be borrowed from the front desk.

A YULE-LOG VIDEO is a seasonal workout tape of sorts - for evening sit-downs, not sit-ups.

The idea dovetails with the suddenly voracious appetite for downloadable media among online consumers and the long success the fitness industry has enjoyed in selling home video products like workout tapes.

Although some fitness pioneers made tapes decades ago, the modern fitness video boom really started 11 years ago with Jane Fonda's first workout tape.

You might be surprised at how, say, popping in a workout tape for 30 minutes in the morning can change your whole day.