Equinox was a pioneer in luxury fitness, turning the traditional gym into a social club where members pay a premium for status and amenities. But as competitors crowd the high-end market, the brand is under pressure to maintain its dominance and maximize member spending. WSJ spoke with Equinox Executive Chairman Harvey Spevak, who breaks down the company’s aggressive growth strategy. Chapters: 0:00 Equinox’s explosive growth 0:49 Becoming “sticky” 2:35 Driving up spending 4:44 The even more