Single again Changing Focus/Single Again, a nonprofit program for adults who are separated, widowed or in the process of divorce, provides weekly presentations and small-group discussions in a confidential, comfortable atmosphere. The group meets at 7 p.m. Mondays at First Presbyterian Church, 9325 Presbyterian Circle. An orientation for new members is offered at 6:30 p.m. A social worker meets with the group, which breaks into smaller groups to discuss the topic of the week. For information, go to changingfocus.org.

Chair yoga The East Columbia 50 Plus Center at the East Columbia library, 6600 Cradlerock Way, will offer "Chair Yoga," an easy introduction to yoga that helps to ease the pain of arthritis, reduce fatigue and improve circulation and breathing, at 10 a.m. Tuesdays. Cost is $25 a month. Reservations: 410-313-7680.

Also at East Columbia 50 Plus Center:

•Beginner and advanced line dancing classes with Mary McCormick will be held Mondays through March 29. Cost is $43.

•An evening exercise class will be held from 6 p.m. to 7 p.m. Mondays and Wednesdays. Personal trainer Sharon Cunningham is the instructor.

•A belly dance class will be held from 1 p.m. to 2 p.m. Tuesdays. Instructor Camila Karam will teach hip movements, stretches, arm and hand techniques, and veil dancing. Cost is $25 a month.

•A yoga class with Camila Karam is offered from 3 p.m. to 4 p.m. Tuesdays. Cost is $24 a month.

•Beginners' tai chi classes take place 4 p.m. to 5 p.m. Wednesdays. Cost is $24 a month.