If you agree to take part in this study, you will exercise on a stationary bicycle, while breathing through a mouthpiece and wearing a nose clip, before your surgery. You will be asked to pedal at 60 revolutions per minute as the resistance to pedaling gradually increases. During your pedaling, your vital signs will be monitored using a blood pressure cuff, electrocardiogram (ECG) leads (to measure the electrical activity of the heart), and a pulse oximeter. The mouthpiece is used to analyze the inhaled vs the exhaled breaths. The nose clip is to remind you to breathe through the mouthpiece. This will help researchers learn the level of oxygen uptake during exercise, before surgery.