While some elements of the strength and conditioning portfolio have yet to achieve acceptance in the preparation of athletes in all sports, one area of practice which is almost universally accepted is the principle of the warm-up. Today, few athletes at any level train or compete without some attempt at a “warm-up”. However, while the general principles surrounding the need to warm-up remain valid, alarge body of evidence is building up which both questions some ofour current practices, and provides possible opportunities to improve practice. This article looks at current practice, and presents a model around which to construct effective warm-ups.