&gt;The spinning instructor was echoing a message we&#x27;ve been getting for years: As long as you get on that bike or treadmill, you can keep indulging — and still lose weight<p>Who is saying this?  Anyone who has spent an hour educating themselves on the subject knows that it&#x27;s all about calories in v calories out.  That can be accomplished via the gym and the kitchen, or the kitchen alone.<p>Exercise provides additional benefits; higher caloric deficit assuming the same diet, muscle tone (appearance and burns more calories when you&#x27;re doing nothing), and general cardiovascular health.