Most athletes can relate to this. When you get ready to do a particular sport or event, your body will tell you if something isn't right. For example, as powerlifters, it might be as simple as a small discomfort or dull ache in your right upper buttock area as we set up for a heavy squat set. A tennis player may feel a slight pain in the elbow region as they grip their racquet. My point is, if you feel these things when you workout or compete, then you don't have the aforementioned four qualities in the right quantities.
Stability is one of the most important aspects that any athlete needs to succeed.
Multiple joint complexes working together, such as the spine, provide the stability needed to do large movements of the body, such as running, squatting, etc. In order to maintain stability, the body uses the nerves and the nervous system to feedback information from the area under demand to the brain and back again. It uses the muscles and tendons to contract and relax in proper amounts and length of time in order to hold the joint stable when it is being stressed. The bones, along with the ligaments, provide the structural support of the joint. All of these components provide the body with stability when under stress.