All participants will be given a pencil and pad to note the date and time that they first pass gas from their rectum. A calendar and clock is available in all patient rooms. Every morning, the study investigator will visit you and ask if you have passed gas, record the number of rocks and steps recorded by the pedometers, reset the pedometers, have you complete a Brief Pain Inventory-Short Form pain evaluation, and check on the total amount of pain medication you have received over the last 24 hours. You may increase the time spent rocking and walking as you desire and are encouraged to do so.