His theory is primarily that our personality is formed by our positive
and negative experiences in life, and that with each stage of his
development, we experience certain stages in our personality
development.
They can be legitimate or excuses. If a person genuinely can’t bench 50 pounds because they’re not strong enough to lift the bar that’s barrier but if someone can do something such as run on the treadmill for 5 minutes but just don’t want to that’s an excuse.
The three main categories are health, disease and safety.