It's like a second job.

We are currently training for a marathon. Into the stage of long miles. Run. Thats all we plan on the day of our scheduled long run. We don't schedule anything social. We'll be too tired. and perhahps sore. We are running/walking about a 13 to 15 pace, average. So we need to plan on 5-6 hours to run, get to the location and get home.

After our last marathon, we took the 'rest' admonition seriously and quit running or exercising. It was the beginining of our downfall--struggling to get back in the habit and pattern of exercise.

We didn't intentionally exercise.
When we did, it was an add on to our life.

By approaching our exercise as intentional ( and a second job), planning our daily exercise, we continue the mindset of exercise as part of life.

Health, in its largest sense, is the motivation for intentional forward motion.
Intention, focuses the effort.