DES MOINES, Iowa--(BUSINESS WIRE)--As part of its new digital experience for participants, the Principal Financial Group® has introduced an interactive Retirement Wellness Planner to help users easily manage, visualize and plan for their retirement savings goals. The Retirement Wellness Planner includes interactive sliders, intuitive prompts and a real-time savings graph that focuses on monthly income in retirement and how long that income may last. Participants are able to take immediate actio