Why is warm up exercise done?

Question have you (or someone close to you) experienced a merger (vertical integration) in a current or past job position? if so, what are some major challenges and strengths of implementing vertical integration? if you have not experienced vertical integration (or do not know anyone who has undergone vertical integration), can you think of a well - known company that has merged with another corporation? what were the strengths and weaknesses of this newly formed business arrangement? type of merger (vertical integration): major challenges/strengths of vertical integration? recap (after live classroom session): what new idea/skills did you learn?