There is a cost to trying to maintain maximum fitness at all times.
When navigating a fitness landscape, you often need to go down (into a valley) to reach a higher peak.
Upgrading your life systems (in every life area) has costs. If you’re never willing to pay those costs (emotional, financial, time, energy, learning curve), you limit yourself.
Example 1 (Social):
Sometimes your friends hold you back. I had a tough time in 7th grade — my friends were frenemies. Before things got better, they had to get worse. I endured a period of loneliness until I found new friends, who really acted like friends.