After 30 minutes of sweating on the elliptical, you look down at the console (326 calories burned—not bad!) and start feeling pretty triumphant about your cardio session. After all, you just torched off the calories in the turkey sandwich you had for lunch! Or did you? We went to the experts to find out just how accurate your calorie readout really is. Read on to see which machines you can trust, plus tips on how to maximize your burn.

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