Mrs. Louis Lengfeld, in the opinion of her friends, has not slowed down since she was one of San Francisco's top golfers. Mother of three and grandmother of four, her lifetime of devotion to golf has led her into activities that culminated recently with membership on the President's Council for Youth Fitness. In 1941, when she was president of the California Women's Golf Association, she mobilized golfers for recreational work with servicemen. Out of this grew the Swing Clubs which she directs. A golfing program which began in veterans' hospitals, it has now blossomed into a scheme which includes youth groups, with an eye on golf's contribution to physical fitness and the building of future champions. Under the aegis of the United Voluntary Services, which Helen Lengfeld also heads, top golfers volunteer their time to coach the kids. In a recent eight-month period Mrs. Lengfeld traveled 27,000 miles by car and 12,000 by train to encourage her projects. There are Swing Clubs in 63 veterans' hospitals, some overseas and even on "Texas Towers." In her spare time Helen Lengfeld, who lives near San Francisco, runs the Jr. Girls State Championships at Pebble Beach, edits a golf magazine and stages the women's golf tournaments on the Monterey Peninsula. But she doesn't find time to play golf any more.