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"Being active is an important part of any weight-loss or weight-maintenance program. When you're active, your body uses more energy (calories). And when you burn more calories than you consume, you lose weight.
Because 3,500 calories equals about 1 pound (0.45 kilogram) of fat, you need to burn 3,500 calories more than you take in to lose 1 pound. So if you cut 500 calories from your diet each day, you'd lose about 1 pound a week (500 calories x 7 days = 3,500 calories). Because of changes that occur in the body over time, however, calories may need to be decreased further to continue weight loss."
The article above may be of help for those that are struggling with losing weight. It lists various exercises and what they typically will burn in a hour.