It is easy and convenient to take a reductionist, mechanistic viewpoint that separates the body into parts and systems. We are continually bombarded with this type of reductionism. The problem and it is a big problem is the failure to recognize that for the body to execute movement, whether it is a sustained endurance activity, explosive busts or fine motor skill that all parts and systems must work together in harmony. Movement is s symphony 
not a solo. You can’t do a “cardio” workout; just like you can’t do a “neural” workout. You better hope every workout has a cardio vascular and a neural component, because all systems of the body work at all times with the demand on a particular system determined by the intensity of the activity. To continue the symphonic metaphor a section of the orchestra will be featured or highlighted but the other parts of the orchestra are still playing, albeit in the background. Let's also give credit to the conductor, the brain, the muscles and all systems of the body are slaves of the brain. It is the brain 
that drives, connects and controls movements to enable us to accomplish the desired task. To use Tim Noakes term the brain is the"central governor." So don’t lose sight of the whole, the big picture in the desire to understand the parts. Give the body credit for it’s inherent wisdom and learn to link, sync, connect and coordinate in order to play the beautiful movement symphony we call sports performance.
