I officiated soccer for 24 years (I am 68 years old now) at pretty much most levels (up to semi-pro) and jogged regularly to keep in shape. Now that I am retired from the game (8 years ago) I no longer jog, I took up biking and find it easier on the knee and I bike 30 miles a day 5x a week. Keeps me fit and I get to eat all I want with no weight gain!