Doing a 15 minute running test will allow you to find out where to focus your training. Athlete on Fire goes over a quick treadmill test
Without testing yourself in some specific areas of your health, fitness, and performance, you really have no idea where you are as an athlete. These tests don’t have to be high tech. They can be simple, like the 15 minute test this post is about. Almost as important is the retest. A valid and reliable retest can show where you need to work more, less, harder, or more specifically.