Millennials are spending big on trendy places to sweat

Carla Zuniga is punching a heavy bag as if she were preparing for a title fight, although she's a 35-year-old hair stylist doing her regular workout.

Zuniga isn't sweating at some low-fee, big-box fitness chain. Prevail Boxing is a 1,500-square-foot studio in Los Angeles that charges $250 for 10 classes.

"I think people in my generation are more willing to invest in what challenges them and makes them healthy," said Zuniga, who grew bored with cheaper, traditional gyms. "It's expensive to be healthy, but it's more expensive to be sick."

Costly coffee and artisanal avocado toast may be getting the blame for millennials' inability to afford a house. But those expenses pale in comparison with what a growing segment is willing to spend on fitness, abandoning $30-a-month gyms for trendy studios where classes for cycling, boot camp or