Hi KB, I, also worked out like a fiend for weeks before my surgery. I was bone on bone in my knee which added a real limitation to what I could do. I'm a cyclist and use it for 30 mile rides as well as getting back and forth to work. Also, I discovered that going up stairs was easy and bent the knee so that the bones would not rub and thus cause the pain and swelling due to what I was to get surgery for.
My fitbit reports that I was doing up to 50 flights a day. I'll add that I could go up with no pain, but going down always kept me near an elevator. Yes, I did feel weird about that. I would mow half of my small lawn with our real mower and then take a break on the bike to loosen the swelling and then finish the work afterwards. There will be opportunities to do all of the exercise you need hopefully within a quarter mile walk (which you will be able to do by week 2).
As 'fit' as I was, I really could not even imagine doing anything more strenuous than a day's worth of up and down the stairs in the house. That might give me 10 or 15 flights by the end of the day. You will be eager to elevate your leg and ice more than you could ever imagine.
I laughed at my Doctor when she said I won't feel like going back to work in 3 weeks. I'll listen to anything she says now. I went back to work on Monday, exactly 4 weeks after the surgery and I was surprised that I had lost almost all of my stamina reserves. No bike, so I took a combination of bus and subway to work and by the time I got home I was ready to assume the position with my foot pointing up.
I swear that I learned some tips on this site that really made a difference. Keep this bookmarked for after the surgery! Don't make the mistake of lifting your foot on some pillows and calling that elevated. There are lots of right ways and wrong ways posted on this site. My PT calls it "your heel is a laser and shoot out that ceiling light" It took a couple of sofa cushions to recreate that at home.
You sound like an active person who can't imagine yourself being slowed down...(a lot like me) This surgery will slow you down to the point where you are swollen so much that it feels like you are wearing a tight ankle weight on your thigh (it will make sense, I promise) Listen to your body. Mine has been good about saying 'go ahead!' Hopefully yours will too. Also, stay tuned to this site! It's full of terrific helpful people who have been right where you are at any given time!
Have a great surgery!