Out here a lot of the farmers - and other types of laborers - are in a state of constant motion. During the week days they are working, and on the weekends they are working, or otherwise they are hiking with heavy packs or engaging in other similarly demanding recreational activities. This constant motion must exact a toll - and it does - as around middle age there is constant complaint of various bodily pains and ailments.
The body craves rest. As soon as one stops moving, the fatigue that sets in is deep and sustained. This is why everyone is constantly moving. But it isn't a bad idea to lay back and let the body shut down for a while.
