The number of people using exercise machines...

The number of people using exercise machines in the United States (1997) who worked out on:

* Stationary bicycles: 42.8 million.

--Average 56 workouts a year.

* Treadmills: 32.9 million.

--Average 56 workouts a year.

* Stair-climbers: 18.2 million.

--Average 50 workouts a year.

* Rowing machines: 8.1 million.

--Average 45 workouts a year.

* Cross-country ski machines: 6.8 million.

--Average 46 workouts a year.

Source: Fitness Products Council