(MILWAUKEE) – Nick Rubner is a man on a mission to push the boundaries of fitness. The certified personal trainer recently launched a business called "Innovation Fitness" that helps and encourages people of all abilities to get in shape, and he’s using his own story as inspiration.

Rubner has complete Tough Mudder challenges, Spartan races and holds a black belt in martial arts, but despite his many physical achievements his path has not always been easy.

On CBS 58 Sunday Morning, Jacquelyn Abad shows why his innovative approach to fitness had to begin at a young age.