Madison Sidney, known by her nickname "Moo," is prominently featured on the successful YouTube channels In Mad's World and In Mad's Gym. She began her gymnastics journey at the young age of three and went on to become a competitive USAG gymnast for seven years. Eventually, she shifted her focus to volleyball and soccer, all while continuing to build her career in the entertainment industry. Madison launched her YouTube channel in January 2015, which has since garnered over 80,000 subscribers.
