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This month, more than half of Americans probably made health-related New Year's resolutions, but few are likely to stick to them. Employees at CFI Westgate Resorts in Orlando, Fla., might consider themselves lucky: They have an incentive to get healthy. If they join in the company-wide weight-loss contest and reach their goals, they could win cash prizes or a luxury vacation. Westgate isn't the only employer trying to push employees, especially obese ones, into healthy lifestyles. But using incentives, and in some cases penalties, to change employee behavior raises a host of legal, moral and practical questions, according to Wharton experts and others.