Payal Kadakia is the CEO and co-founder of ClassPass, a two-year-old start-up that gives customers access to thousands of boutique fitness classes in their area.
"ClassPass is only two-year-old, but it has already booked more than 7 million fitness class reservations at gyms and studios across the US, plus Canada and the UK," Fortune said in a statement.
Kadakia says she started the company after trying and failing to find a ballet class in New York City that she could attend.
Fortune said Kadakia's idea tapped into a fitness craze.
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Each year, Fortune crowns 10 innovators, groundbreakers and game changers as 'Most Powerful Women Entrepreneurs'.
This year's 10 Most Promising Women Entrepreneurs will be honored at a Fortune summit in Washington.
"From drones to metal alloys to snack foods-that covers the range of innovation coming from Fortune's newly anointed Most Promising Women Entrepreneurs," Fortune said.
The other honorees this year are Brit Morin, founder and CEO, Brit + Co, Jody Miller, co-founder and CEO of Business Talent Group and Christina Lomasney, president and CEO of Modumetal.