The answer usually is "as soon as you are ready." However, this depends on the activities you have in mind. Some activities, like high-impact sports and recreation, are not recommended after hip replacement surgery. Other activities, like walking, swimming, and cycling, can usually be started once your pain is controlled and your strength improves. It is generally just a matter of getting warmed up and used to doing those kinds of activities again. You should begin these activities in a gradual, guided manner to avoid injury and complications. Be sure to ask your doctor if you have questions about the activities you'd like to do.