Is Stretching the same as Warming Up?

Sang H. Kim, author of Ultimate Flexibility answers this question, "While you may include stretching in your warm-up, stretching to increase flexibility should never be a part of warming up. A warm-up is best made up of 5-10 minutes of light aerobic activity that engages the whole body. It should increase body temperature and circulation but not be fatiguing. Stretching to increase flexibility should ideally be done after the strength and cardio portions of training, when the muscles are at their warmest."