Now imagine if one of the front or back tires did not have sufficient air in it? Or what would happen if we did not tighten all the bolts as needed? Or what if the wheels were not aligned correctly? It is obvious that neither of these cars would run smoothly and they would eventually break down. Other parts of the car would be affected.
Try and imagine that the your arms are the front tires, your legs the back tires, your brain is the electronics and your abdominal, lower back and buttocks areas – what is commonly called the CORE of the body – is the engine.