When stretching, it is important to practice both dynamic stretches, and static stretches. Dynamic stretches (warm-ups) should always be performed at the beginning of a workout or practice. They are active movements that usually copy movements that will be performed in the workout in order to "wake up" the muscles and joints being used. Static stretches (cool-downs) should always be performed after a workout or practice. They are positions that are held for a certain period of time.