• The Sierra Club's Allegheny Group is sponsoring a ski-touring trip in the Laurel Mountain area or hike in Moraine State Park or at Goddard State Park on March 15, depending on snow conditions. Participants should be in good physical condition. Call 724-327-7582.

• The Greater Pittsburgh Road Runners are sponsoring the "Larry Winschel St. Paddy's Day Run," inlcuding 4.2- and 2-mile runs and a 1-mile walk, at 10 a.m. March 16 at the children's playground in South Park. Registration begins at 9:30 a.m. The cost is $1. Call 412-833-0850.

• OASIS, 10th Floor, Macy's Department Store, 400 Fifth Ave., Downtown, is holding intermediate classes in t'ai chi from 1 to 2:30 p.m. Thursdays from March 13 through May 1. The cost is $21. Call 412-232-2020.

• Rapha Ministries, 6942 Upland St., Lincoln-Lemington, is offering a free "Family Walking Aerobics" physical fitness program fron 1 to 2 p.m. Saturdays beginning March 15. Call 412-403-6505.

• Schoolhouse Yoga, 2401 Smallman St., is holding a "Yoga for Kids" workshop, for children ages 7 through 12, from 2:30 to 3:30 p.m. March 16. The cost is $10. Call 412-401-4444.

• The Butler YMCA, 330 N. Washington St., is sponsoring "Keep Moving," a fitness and anti-arthritis program for older adults, through March. A presentation, including a buffet luncheon, is taking place from noon to 2 p.m. March 19. The deadline is March 17. Call 724-287-4733.