Treadmill - level @ 5 mph

This activity burns approximately 566 calories per hour

Vigorous activity is anything that requires 6 METS, or 6 times your resting metabolism. Two good examples of exercising at vigorous intensities are walking or climbing briskly at 5 mph. This will expend over 7 calories a minute and elevate your resting metabolism for hours during the day — the faster you climb, the more calories you burn.