Participants in Group A will get out of bed beginning the first day after surgery, sit in a rocking chair (at least twice per day), and rock backward and forward at a constant rate of 1 backward and forward rock per second in 10-20 minute increments. This will be done for at least 60 minutes (1 hour) per day. Participants in Group A will also be asked to begin walking at least twice per day beginning the first day after surgery.