Preload refers to the process of loading data or resources into memory before they are actually needed. This technique is commonly used in computer programming and web development to improve performance and reduce wait times. By preloading images, scripts, or other assets, applications can provide a smoother user experience, as the necessary resources are readily available when required. In the context of exercise physiology, preload specifically describes the initial stretching of the heart's ventricles before contraction. This stretching is influenced by the volume of blood returning to the heart, known as venous return. A higher preload can enhance the heart's efficiency, allowing it to pump more blood with each beat.