Boomercize is aerobics for people who predate Jamie Lee Curtis in "Perfect." Willow Carter of San Francisco is old enough to remember the Watusi, and she is in class "movin' and groovin' to hit tunes ...

We know that nothing gets you through your workout like music—a good melody to distract from the pain, a steady rhythm to keep the pace or a jolt of extra emotion to get you closer to the finish line.

Earlier this year, Hilken Mancini learned that the band Green Day liked her approach to aerobic workouts. Mancini, who found brief fame in the 1990s as a singer-guitarist for the Boston-based indie ...