My, but you are a healthy lot!!
I used to do Tae Kwon Do, Tai Chi, and quite a bit of hiking.
I still get out for a hike in the Dragoon Mountains near Tombstone, occasionally.
But, for me just simply walking (roughly 3 miles per day) is about all the exercise I can take, these days.
I go for my stroll early each morning (generally sometime between 5:30 and 6:30 a.m.).
Other than that, I just play with pistols and roll around in the dirt of the streets of Tombstone, Arizona for the amusement of tourists, for exercise.