She gave Styles and his team a private session on Tuesday afternoon after getting tested for coronavirus.
"I was tickled," Belle said. "It's validating that he selected our studio to get a super effective workout. My team and I work hard to create a consistent and full body workout in every class."
The workout focuses on strength, balance, core and flexibility.
The studio, located off Wake Forest Road, is right next to Chido Taco Mercado, a taqueria. Alex said he was picking up tacos when he saw Styles exiting the studio.
"It was so crazy," Alex said. "I couldn't get to my camera fast enough. I was completely shocked."
Belle said the team did everything they could to make sure the workout was COVID-safe.
"It was a private lesson. They are super-strict on COVID-19 protocols," she said.
"He was really strong," Belle said about Styles.
On Monday, The Carolina Hurricanes posted a picture of Styles alongside Sebastian Aho and Martin Necas.
Following the star-studded round of golf, the Hurricanes changed their name on Twitter to the 'Carolina Harrycanes' and bio to "We Adore You, Caniacs," a nod to Styles' song "Adore You" off his Fine Line album.
Styles is performing at the PNC Arena on Tuesday night as part of his Love On Tour. All guests must provide proof of a coronavirus vaccination or a negative test before attending.
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