People support their own ideas. Don't breathe down your employees' necks. Don't over supervise. Your employees know what needs to be done, so let them do it. Each employee is an individual, and each responds in his or her own way to the same work situation or incentives.
Some people are so ambitious to get ahead that they do their best even at jobs they dislike.
Others may have less drive and will require more of your attention. If employees feel that rewards are used to control them, those awards could instead be demotivating. Reward what you ask for. The frontline supervisor can have the most positive or negative effect on employees. The supervisor can be the strongest motivating or demotivating element of all.