The Willows at Westborough, a retirement community for active seniors, will host its 19th annual Senior Fitness Day Wednesday. Interested attendees can sign up the day of the event, which kicks off at 9 a.m. and ends around noon. The fitness day, which is free, gives older adults the opportunity to renew their commitment to health and fitness, and will feature keynote speaker Karen McKenzie, director of the personalized exercise program at The Willows. Her main topic will be “A Balancing Act — Preventing the First Fall,” a discussion on prevention of debilitating falls for seniors. The event will also feature free health information, blood pressure checks, and balance screenings. Those interested are encouraged to call McKenzie at 508-366-4730, ext. 3577, to reserve a space.