Technically, you can lose weight without also doing daily exercise. Weight loss is all about creating a calorie deficit – meaning that you burn more than you consume. That’s why exercise, plus diet changes, are an important part of a weight-loss and weight-control plan.
First, exercise helps create a significant calorie deficit – after all, you can burn 600 calories with an hour in a spin class. Second, exercise builds muscles, which burn more calories than fat even when you’re at rest. So exercise helps amp up your metabolism.
While you can lose weight without exercise, it’s healthier to adopt a whole food diet plus a routine of regular physical activity that gets your heart pumping and muscles working.