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24 Hour Fitness Founder Mark Mastrov Steps In as Interim CEO

Karl Sanft is no longer CEO of 24 Hour Fitness. Founder and executive chair Mark Mastrov will serve as interim CEO. 24 Hour Fitness said in a statement to Club Solutions, “We can confirm that Karl Sanft is no longer with the company. We are grateful for his leadership and contributions during his tenure, and we wish him all the best in his future endeavors. 24 Hour Fitness founder and executive chair Mark Mastrov will serve as interim CEO. 24 Ho…
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Club Solutions Magazine broke the news on Thursday, August 20, 2026.
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