NRTHRN Strong, the Copenhagen-born fitness concept redefining functional training through a Nordic lens, today announced the launch of a new Cardio class at its Flatiron flagship studio. Introduced in response to strong demand since opening in October, the new class expands NRTHRN Strong’s signature training method while remaining rooted in the principles of cross-country skiing.
Since opening its first permanent U.S. studio in New York City’s Flatiron District, NRTHRN Strong has seen tremendous reception from the city’s fitness community, building on the momentum of its sold-out Hamptons pop-up. The addition of Cardio provides guests with an even broader way to experience the brand’s patented NRTHRN Trainer machines and full-body, low-impact modality.
The Cardio class is a high-intensity, endurance-focused workout designed to elevate heart rate through rapid, powerful intervals. The class pushes cardiovascular capacity and boosts VO₂ max while maintaining the joint-friendly benefits of movement inspired by cross-country skiing. Expect a fast-paced, sweat-drenched session that challenges stamina, builds endurance, and delivers an adrenaline-fueled training experience.
“New York has embraced NRTHRN Strong in a way that’s been incredibly energizing for us,” said Nicoline Roth, founder and CEO of NRTHRN Strong. “Since opening in Flatiron, the response has exceeded our expectations, and our community has been eager for more ways to experience the modality. Adding Cardio gives our guests another powerful option to train with us, while staying true to the cross-country skiing principles that define NRTHRN Strong.”
NRTHRN Strong’s patented NRTHRN Trainer machines replicate the rhythmic, full-body motion of cross-country skiing, one of the most effective total-body workouts in the world, delivering cardiovascular benefits, muscular strength, and endurance without impact on the joints. The Flatiron studio features an updated version of the machines, each equipped with interactive tablets that track performance and display real-time workout data. With the launch of Cardio, NRTHRN Strong is also introducing a new tablet experience where data is saved, allowing members to track their progress over time and measure performance across classes.
The new Cardio class joins NRTHRN Strong’s existing lineup, which includes Signature Strong, a total-body strength and conditioning workout, and Sculpt, a Pilates-inspired class focused on precision, control, and deep muscle activation. Together, the three class formats offer a well-rounded approach to training that supports strength, endurance, mobility, and balance.
Located at 35 W. 21st Street, NRTHRN Strong Flatiron is designed as a year-round destination for smarter, more sustainable training. Inspired by Nordic principles of balance, simplicity, and community, the studio provides a welcoming environment where guests can train hard, recover well, and connect with others.
To learn more or reserve a spot, follow NRTHRN Strong on Instagram and visit the website.
Founded in Copenhagen in 2022 by Nicoline Roth, NRTHRN Strong is a Scandinavian-inspired fitness and wellness concept redefining the full-body workout experience. At the core of the method is a patented machine designed to replicate the natural movement of cross-country skiing, delivering a low-impact, high-intensity workout that blends cardio, strength, and mobility.
Rooted in Nordic values of balance, simplicity, and connection, NRTHRN Strong emphasizes sustainable performance, community, and longevity. Following the success of its flagship studio in Copenhagen, the brand has expanded internationally, with a pop-up in Sag Harbor, NY in summer 2025, its first permanent U.S. studio in New York City’s Flatiron District, and now a winter pop-up in Aspen, Colorado.
Nicoline Roth, born in Copenhagen and deeply connected to her Scandinavian heritage, founded NRTHRN Strong to bring a more thoughtful, functional, and human-centered approach to fitness. She is also the co-founder of BEBOLD, an international women’s community and brand-building partner for female-led businesses.
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