You can't motivate a group of people or a Team. You have to motivate people individually, and that motivation has to be in an environment in which that person has a goal - something they want to accomplish in their lives.
In adversity, there is opportunity. Show me someone who has done something worthwhile, and I'll show you someone who has overcome adversity. I've never known anybody to achieve anything without overcoming adversity. Adversity is another way to measure the greatness of individuals. I never had a crisis that didn't make me stronger.