Yesterday I had to run 200 meters between rounds of back-squats and I noted that it didn't tire me out near like what it once did. My knee even seemed happy with it - though it would have likely been even more happy if I had been in my running shoes rather than cross-fit shoes. I am beginning to wonder if it is time to try some gentle run/walking outside on dirt to see what that feels like when the weather permits... Please note I didn't say that I was running very fast, but I wasn't doing it for time. I suspect that I should probably wait to start trying this until after my 70 flights of stairs in early March...