=+79. Exercise equipment. A leading manufacturer of exercise equipment wanted to collect data on the effectiveness of their equipment. An August 2001 article in the journal Medicine and Science in Sports and Exercise compared how long it would take men and women to burn 200 calories during light or heavy workouts on various kinds of exercise equipment. The results summarized in the table are the average times for a group of physically active young men and women whose performances were measured on a representative sample of exercise equipment.

Average Minutes to Burn 200 Calories Hard Exertion Light Exertion Men Women Men Women Machine Type Treadmill 12 17 14 22 X-C Skier 12 16 16 23 Stair Climber 13 18 20 37 Rowing Machine 14 16 21 25 Exercise Rider 22 24 27 36 Exercise Bike 16 20 29 44