Program Information Plus One is now an Optum company, known internally as Optum On-Site Services. On-Site Services ignites employee activation in health ownership and drives engagement in health and wellness programs. Because our services are located at the employer???s worksite, our local presence positions us to build trusting relationships, nurture emotional commitments and discover employee aspirations; and our on-site staff are the educators for these health and wellness programs. Our services cater to populations within corporate, government, and education, and our on-site capabilities include fitness, clinics, nutrition, ergonomics, coaching, and health promotion.