After you have recovered from your knee replacement surgery, you should be able to walk normally with minimal pain or no pain at all. You'll likely be able to return to your normal activities. It's crucial is to take your time during the recovery process, complete all of your physiotherapy, and wait until your knee is fully recovered before doing all the things you used to do pre-surgery.  Make sure to get the ok from your doctor or physiotherapist before returning to any activities. Pending on your recovery and your own situation it might be recommend that you exercise for 20 to 30 minutes, 2 or 3 times a day and walk for 30 minutes, 2 or 3 times a day during your early recovery – Orthoinofo