SoulCycle devotees are religious about their workouts

When SoulCycle opened its first Texas location on Kirby in April, fans of the nation's popular indoor-cycling studio came out en masse.

Amy Krasner was one of them. She signed up for the first class on opening day.

"I'd been waiting patiently, but mostly impatiently, for it to open here," said the 47-year-old who tried SoulCycle for the first time in New York five years ago. "I love it. It's fast paced, challenging, and I can get my sweat on."

With its happy-yellow bikes and décor, SoulCycle has carved out a niche in the boutique fitness world where clients pay about $30 (plus shoe rental) for a 45-minute group class that sells out quickly. It's a mix of dance, cardio and therapy, as instructors empower and uplift participants with "feel-good" affirmations.

The classes are popular with celebrities, including Oprah Winfrey, Michelle Obama, Lady Gaga and Houston native Hilary Duff. The first lady even tweeted about it last year: "I love it when my girls join me for a little SoulCycle. We all are in the dark, moving to the beat on the bikes. We love it."

"If SoulCycle hadn't opened here," she said, "I be drinking rosé at Brasserie 19."