What is atrophy? It is anything that is wasting away.
Because of the fall of man and the entrance of sin into the world, atrophy happens all the time.
Let me give you some examples.
If a farmer doesn't tend to his field, it will grow weeds.
If an athlete doesn't workout, he will grow weaker.
If a husband doesn't spent time with his wife, they will grow apart.
If a business owner doesn't work his business, it will fail.
If a Christian doesn't exercise himself to godliness, he will grow carnal.
The world is not winding up; it is winding down.