I had TKR 11 years ago and I find the being very active gives me some discomfort short term. After retirement I started exercising at the gym using machines. I believe that exercising moderately is key to controlling pain after TKR. Currently I have started the process for a 2nd TKR (left this time), but want to get as much mileage out of this knee as I can. I cannot imagine being as active without TKR and would do it over in a heartbeat! I might add that I currently do not take any pain medications.