This is from the Australian Healthy Food Guide Magazine:
Activity & Kilojoules burned in 30 Minutes
Watching TV/Computer - 80kJ
Ironing - 260kJ
Slow walking - 300kJ
Vacuuming - 370kJ
Brisk Walking - 450kJ
Washing the car - 480kJ
Mowing the lawn - 500kJ
Yoga - 530kJ
Aerobics - 830kJ
Swimming - 880kJ
Tennis - 980kJ
Walking up stairs - 980kJ
Jogging - 1100kJ