F45 Training is muscling in on Wall Street as it begins trading on the New York Stock Exchange. Founder and CEO Adam Gilchrist joined Cheddar’s Closing Bell to talk about the IPO and the next phase for the business. “We think our total addressable market could be bigger than a Starbucks,” he said. The venture also is being backed by some serious star power like Mark Wahlberg. "More importantly than being a great influencer, he believes in our workouts," Gilchrist said, also mentioning David Beckham would be getting on board with the company in the future. Other celebs tied to F45 include Steve Aoki, Magic Johnson, Greg Norman, and Cindy Crawford.