Treadmill - 15% incline @ 6 mph

This activity burns approximately 1,072 calories per hour

A 6-mph walking pace can build aerobic endurance and maintain your body weight. However, if you'd like to bump up the intensity a notch, try walking on a treadmill while gradually adding elevation. After warming up for 5 minutes, increase the incline by 1 to 2% every 5 minutes until you reach a 15% grade.