Nikkei and Retirement will hold a seminar entitled “Retirement: Health and Exercise” from 1 to 3 p.m., at the Japanese Cultural and Community Center of Northern California, located at 1840 Sutter St. in S.F.’s Japantown. Dr. John Umekubo, an internist, Rodney Chin, the executive director of the Buchanan Street YMCA and Ryan Kimura, program director of the JCCCNC, will discuss the exercise programs available at their respective institutions. Info: (415) 567-5505.