They may seem trivial, but warm-ups are an important part of the strength training process. Unfortunately many people either fail to do them properly (or at all), or they overdo them, missing the point that warm-ups are, well, a warm-up. Popular slogans like "our warm-up is your workout" don't help the matter, implying that the warm-up must be an intense, drawn out matter. The warm-up serves one purpose: to prepare us for the work sets, where we will actually impart the stress necessary to drive adaptation.