How much should you exercise per day to lose 8 kilos?

There's really no telling, it's all down to what you're eating and how hard you're working out.

With the high-calorie foodstuffs we have available today, every attempt at weight loss pretty much has to start by controlling your intake.

For most of us, it's just not possible to exercise hard enough to compensate for a really poor diet. One single cupcake outside your allowance will take something like 45 minutes of hard workout to use up.

But with a controlled diet and exercise, it's possible to lose 0.5-1.5 kilos/week w/o any health concerns.

Every bit of exercise helps, but you should aim for at least 45 minutes. Shorter than that, the body can handle on the energy that's basically stored in the blood. Somewhere areound the 45-minute mark that will be used up, and the body will have to turn to using fat as fuel.