The Rio Olympics may have fired you up to restart your exercise program but let’s face it, none of us are ever go to run a 5,000 meter race. Think a little less ambitiously. Like fencing. Adult classes at the Halberstadt Fencing Club, here since 1942, on South Van Ness start September 5. Novices are welcome to learn basic footwork with foils, epees and sabers. One class a week for 4 weeks for $100 a month. If you find your inner musketeer you can sign up for beginners classes.