Most people think about this from the obvious perspective. Don't be afraid to try something new. Don't be afraid to join a gym. Don't be afraid to push yourself beyond your comfort zone. But that's not the kind of fear I want to talk about today.
Why do you train? For me, there almost always comes a point in a hard workout where that little voice in my head says: back off, take it easy, have a rest. And that’s the point where I try to do the opposite - turn up the intensity, push through, and get it done. Because if I step back and evaluate my fitness objectively, I probably have more than I need.