C&V, thanks for asking! Today is day 4 post op and yesterday was great, today not so much. Based on the very short bit of experience I have, it appears that doing 20-30 minutes of walking on a slow treadmill may have contributed to me feeling so good yesterday. I really thought the worst was over. I had walked first and second day after the surgery, then yesterday - good day - but didn't walk yesterday and woke up this morning feeling as if I was back on day one again. So...walked today, this afternoon, and have felt better the remainder of the day.