I am 68 years old, retired and in decent health, hip replacement in June 2017, and slightly on the heavier side. I stay fairly active with the grandkids, but I didn't walk much in advance this year. For July 2018 my Fitbit logged: Day #1: MK 11.49 miles, Day #2: HS 9.48 miles, Day #3: AK 10.51...