Accumulating high numbers in your training log doesn't always mean you are training better. It is easy to forget about all the other components that make you a stronger, faster and healthier athlete.
The body is made up of different systems: muscular, skeletal, cardiovascular, respiratory, circulatory, endocrine, nervous, etc. To be a complete athlete, to stay healthy, and to reach your full potential you have to optimize each one of these systems. Re-fining technique and skills, increasing your strength, working on flexibility, recovering properly, eating properly, improving your efficiency and well being altogether, are things that unfortunately are often neglected over putting in distance. Many athletes don't like working on these different areas because they feel it is a waste of time. Unfortunately, they only start paying attention to it when an injury prevents them from training. There has to be a good ratio of working on these different systems, depending on what you want to accomplish and what your weaknesses are.
For example, if you get sore or fatigued after doing simple drills, like plyometrics/jumps or core work, then that is a sure sign that you need to do more drills and strengthen those muscles. It’s a weakness that needs to be addressed. As in all training, it is important to slowly build the intensity and complexity of the drills, and allow the body to recover and adapt to have positive results. More experienced athletes, even those who seem to have good skills and correct technique, need to continue practicing and perfecting them on a regular basis. Just because you don’t get sore from a drill, doesn’t mean you don’t need to continue doing it, or a more advanced version of it.
All aspects of training have to be addressed in a balanced way. If an athlete focuses too much on power he or she may lose some of the finer motor skills necessary to be more efficient. An athlete that focuses too much on technique may neglect building endurance or strength. There are also other athletes that manage to train all the required systems, but neglect recovery.
Our body is build of many components that work together in harmony. For every action there is a reaction. If we neglect an important component, sooner or later we'll see a negative response. As athletes, this is even more obvious since we are constantly demanding more from our bodies.
Keep a healthy balance in your training and you'll be able to enjoy it for many years to come and see even better results than you could imagine.