phone selling

Would you put steaks and burgers on the grill before it was hot?  Would a pitcher throw as hard as he could without first throwing some long-toss and then pitching 20-30 slower pitches?  Would a runner sprint without stretching?  If you were in a cold climate in the middle of winter and your car was parked outside overnight, would you shift into drive without letting the engine warm first?  If the concept of warming up makes perfect sense, then why in the world wouldn’t salespeople do this?