In this guest column by Michelle Sierpina: Osher Lifelong Learning Institute at UTMB Health will be one of about 1,000 official sponsors nationwide celebrating the 21st annual National Senior Health & Fitness Day on Wednesday. On this day, OLLI members and visitors will join with an estimated 100,000 seniors across the country expected to learn about and experience active, healthy lifestyles through physical fitness, good nutrition and preventive care.