Doing consistent exercise over time while increasing intensity and volume of the exercise will improve overall performance. How? This is because the more we practice something the better we can do it naturally, and become more comfortable in the movements. As well, doing the same exercises or similar workouts will improve strength and muscle mass in those particular areas you are focussed on. By putting continual force upon a particular muscle group over time your body will break down your muscles as part of strengthening them. Without continuous force, the same muscle group over time will lose muscle mass. That is why if you take a few weeks or months off from exercise you will find it hard to get back into it or have the same strength you had before.
Seeing improvement in your training and performance doesn’t happen overnight, it occurs over time through doing continuous training and exercise. Without consistency in your training you will not see your full potential!