The Equal Employment Opportunity Commission last month brought its first legal challenge to an employer’s wellness plan. Filed in federal court in Green Bay, Wis., EEOC v. Orion Energy Systems Inc. makes clear that the lines between incentives to increase employee participation and impermissible penalties that render wellness plans involuntary prove blurry. While wellness programs have gained increased popularity with large and small employers alike and can be used to cut costs, yield health benefits and …