• The Sierra Club's Allegheny Group is sponsoring the following events:

-- Spelunking, Bear Cave on Chestnut Ridge near Blairsville, May 17. Call 412-351-4068.

-- Backpacking, Quebec Run Wild Area of Forbes State Forest along Chestnut Ridge, May 17 and 18. Meet at 7:45 a.m. May 17 at Gateway Middle School, 4450 Old William Penn Highway, Monroeville, and depart by 8 a.m. Return by around 7 p.m. May 18. Call 412-867-0813.

-- Hike, Coopers Rock area in West Virginia, May 18. Call 412-362-5567.

• The Community Design Center of Pittsburgh is sponsoring the PNC Pedal Pittsburgh 2008 at 6:30 a.m. May 18 at Station Square. The cost is $30, $60 for families. To register, call 412-232-3545 or e-mail mleiberton@cdcp.org. See a map of Pedal Pittsburgh

• The St. Margaret Fitness Classic 5K Run/Walk is taking place at 8:30 a.m. May 18. The cost is $20. Call 412-784-5169.

• The sixth annual WonderGirl (formerly Girls on the Run) 5K event is taking place at 9 a.m. May 18 at Sandcastle near the Waterfront, Homestead. For information, call 412-641-6636 or e-mail mcolaizzi@magee.edu. Download a registration form at http://www.girlsontherun.magee.edu/events.html.

• Madeline Martucci is teaching Hatha Yoga classes from 10 to 11:30 a.m. Sundays from May 18 through Aug. 31 at the Boyd Community Center, 1220 Powers Run Road, O'Hara. No class is being conducted May 25. The cost is $128, which may be prorated; otherwise $10 per class. To register, call 724-337-3750.