Marvin Jack Marinovich (August 6, 1939 — December 3, 2020) was an American college and professional football player who became a strength and conditioning coach.

After a disappointing three-year career, where he over-trained himself based on weight and bulk with little time for recovery, Marinovich left to focus on sports training.

Marinovich studied Eastern Bloc training methods and was hired by Oakland Raiders owner, Al Davis, as one of the NFL's first strength-and-conditioning coaches.

Marinovich learned to focus more on training for speed and flexibility, and much of his work became the basis for modern core- and swimming-pool-based conditioning programs.

[4] He later opened his own athletic research center, and began applying the techniques to his children, Traci and Todd Marinovich, introducing sport training before they could leave the crib and continuing it throughout childhood and adolescence.

[5] Todd Marinovich became a high school football legend, dominating all records in Orange County and coming to national attention when Sports Illustrated published an article, titled "Bred To Be A Superstar", that discussed his unique upbringing under his father who wanted to turn his son into the "perfect quarterback".

The article declared Marinovich "America's first test-tube athlete", and mentioned his mother took him to museums, played him classical music and jazz while banning cartoons as too violent and instead viewing films by Alfred Hitchcock.

"[6] Todd Marinovich went on to have a solid career at USC, but began to show signs of emotional rebellion against his strict upbringing under his father; by the time he entered the NFL as a first round draft pick, he soon became a major bust due to personal issues.

[10][11] In 2003 Marinovich together with chiropractor Edythe Heus, wrote and published ProBodX: Proper Body Exercise – A sum of the research and experience in the unique strength and conditioning program.

[7] In 2008 the gym name changed to Sport Science Lab (SSL) and was located at San Juan Capistrano, California.

Penn defeated Florian by a rear naked choke at 3:54 of the 4th round to retain the UFC lightweight title,[15] and then following with another win against Diego Sanchez via 5th-round TKO due to a cut.