July 30 (Reuters) - Indoor cycling fitness chain SoulCycle Inc filed with U.S. regulators for an initial public offering of common stock, underscoring the rising popularity of boutique chains that cater to specific workout methods such as spinning, yoga and barre.
In the context of the input sentence, determine the relationship between 'SoulCycle' and 'Indoor cycling'.
Options: location of formation, parent organization, creator, industry