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.
So many times people are afraid of competition, when it should bring out the best in us. We all have talents and abilities, so why be intimidated by other people's skills?
Teamwork is the foundation of success. The three universal questions that an individual asks of his coach, player, employee, employer are: Can I trust you? Are you committed to excellence? And, do you care about me?