Kayla Itsines’ Sweat app will rake in $77 million this year

In earlier years, fitness gurus would market their programs for getting in shape on VHS tapes and, later, DVDs. These days, it’s an app business. At Apple’s Worldwide Developer Conference this week in San Jose, the company brought in one of the fitness app industry’s superstars, Kayla Itsines, co-creator of the BBG (Bikini Body Guides) and […]...