Terry Knigge of Mundelein works out Monday at the Regent Center in Mundelein. | Joe Shuman~For Sun-Times Media

Helen Ullrich of Mundelein is among seniors who keep fit at the Regent Center in Mundelein. | Joe Shuman~For Sun-Times Media

Betty Luckow of Mundelein participates in fitness classes offered at the Regent Center in Mundelein. | Joe Shuman~For Sun-Times Media

A senior stretches out her calf during her work out Monday at the Regent Center in Mundelein. | Joe Shuman~For Sun-Times Media

Seniors move to the beat during a class at the Regent Center in Mundelein. Fitness classes help seniors with mobility. Zumba and line dancing are among classes offered for those 50 and older. | Joe Shuman~For Sun-Times Media