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.