|Known for||24 Hour Fitness|
The 24 Hour Fitness began in 1983 as a one-club operation called 24 Hour Nautilus. Mark Mastrov and Leonard Schlemm began the firm, with Mastrov and Schlemm remaining to continue its expansion.
In 1998 David Giampaolo and Mark Mastrov co-founded Fitness Holdings Europe, a private-equity-backed investment vehicle, to open and acquire small chains of European health clubs. Fitness Holdings Europe was merged into 24 Hour Fitness Worldwide, Inc. in 2000. In 2010 Mastrov founded Hard Candy Fitness with Madonna, her manager Guy Oseary.
Mastrov was born in 1958 in Oakland, California. He grew up in the San Francisco Bay Area and graduated from Castro Valley High School where he played point guard. He has a bachelor's degree in Business from California State University, Hayward.
- Anderson, Mark (June 5, 2015). "Kings owner Mark Mastrov: Arena will change landscape of Sacramento". Sacramento Business Journal. Retrieved January 6, 2016.
- Dinger, Ed; Dogil, Arianna (2014) [previous version appeared in vol.71]. Pederson, Jay P. (ed.). "24 Hour Fitness Worldwide, Inc". International Directory of Company Histories. Farmington Hills, Michigan: St. James Press (Gale, Cengage Learning group). 152: 2. ISBN 978-1-55862-888-5.
- Chi, Victor (October 14, 2013). "24 Hour Fitness Founder Mark Mastrov Fulfills NBA Dream By Owning Kings". The Post Game. Retrieved January 6, 2016.
- Volk, Pete (November 16, 2015). "NRG eSports, new LCS team purchased by Sacramento Kings co-owners, announces roster". SB Nation. Retrieved January 5, 2015.
- Morrill, David (April 24, 2010). "Fitness mogul wants to shape up Warriors". Contra Costa Times. Retrieved January 6, 2016.
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