Tennis instructors can work for an adult development certification at a two-day workshop at the Homewood-Flossmoor Park District Racquet & Fitness Club, 2920 W. 183rd St. in Homewood. Sessions are from 1 to 5 p.m. Saturday, Feb. 9, and 9 a.m. to 2 p.m. Sunday, Feb. 10. The eight-hour workshop, on the racquet club’s tennis court, is presented by Professional Tennis Registry. It will emphasize the fundamentals of teaching quality group lessons to beginner and intermediate adults, while still maintaining individual attention within the group environment, said Umang Chadda, racquet sports . . .