If you’ve ever wished for a workout that’s equal parts Nordic chic and New York grit, good news: Copenhagen’s buzzy NRTHRN Strong has arrived in Flatiron, and it’ll have you “skiing” your way to stronger abs—without a snowflake in sight.

The Copenhagen-born fitness studio, formerly known as Nordic Strong, has opened its first permanent U.S. location at 35 West 21st Street after a sold-out summer pop-up in the Hamptons . Founder Nicoline Roth’s claim to fame? Patented machines that mimic the fluid motion of cross-country skiing, turning one of Scandinavia’s most punishing outdoor sports into a sleek, indoor, full-body workout.

Each 50-minute session mixes cardio and strength work in what Roth calls “a high-intensity, low-impact flow.” The Flatiron flagship runs three types of clas

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