Good to see that you are back on the bike. I am sure your experience with your first knee will make a difference in recovery for the second. I had planned to wait for my second until January, but my left knee was painful enough I had surgery in August (my right knee was done in January 2015). Before my August knee, I cycled regularly and did gym work and I think it helped with recovery. I have been back on the bike awhile, although right now I am doing more trainer work than on the road riding. My January knee has some stiffness and the clunking that went away sporadically returns. I attribute that to my January knee taking some of the load from my August knee. In the months before surgery my January knee had no signs of stiffness or clunking, but the extra load must be taxing it some. I have stepped up my gym routine and I am working hard on my quads, glutes, hamstrings, adductors, and abductors. For my recovery, the balance of all those muscle groups has been important in doing the activities that are important. But, the return of stiffness to my January knee has been a surprise, but then my August knee is also pretty stiff at times. I do think the colder weather has something to do with that. I'm sure you will do very well with your recovery and continue to offer insightful and helpful comments about recovery for the rest of us.