So, let’s stop being less-than-productive and learn to embrace efficiency and brevity. If you don’t need to stretch, don’t stretch. It doesn’t accomplish anything and it wastes time. If you don’t need to get warmer than you already are, just do the part of the warmup that actually accomplishes something – the part that you were going to do anyway, under the bar, the part that makes the heavier weight you’re using today possible. The heavier weight is the part you want anyway, the aspect of the workout that makes it training, and all the stretching and warmup in the whole entire universe cannot accomplish what that 5 extra pounds can do over time.