“The most important thing is to enjoy your life—to be happy—it's all that matters.”
― Audrey Hepburn
After years of interacting with many athletes, patterns start to show themselves.
The pattern relating to happiness is that runners have their best training and racing when they are happy and enjoying themselves the most.
It does not matter what comes first, a happy runner or great training/racing. What's important is that they fit together and affect each other as they come and go.