5/25/12 Northbrook Participants learn glentle yoga techniques while taking part in a class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Olga Rudiak leads a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Sally Brown and Muriel Pearlman, friends of 80 years, stretch together as they take part in a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Muriel Pearlman and others stretch while taking a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Olga Rudiak twists her torso while keeping her back aligned as she leads a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

Olga Rudiak leads a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

Olga Rudiak leads a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Hands reach to the ceiling as participants stretch and balance during a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

5/25/12 Northbrook Hands come together as participants sit straight on the edge of their seats as they take part in a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media

Participants sit on the edge of their seats as they take part in a glentle yoga class at the Northbrook Public Library on Friday, May 25th. | Dan Luedert~Sun-Times Media