What’s the difference between the upright bike and recumbent bike? Which bike is better for my knees? I have arthritis in my hip, so which bike is better to do at the gym? Which one is better for me after I have knee replacement surgery? These are some of the many questions physical therapists and physical therapy aides hear throughout the day. Each answer is different, depending on the patient’s ability and needs. The upright bike, which is found at many physical therapy off