Madison "Moo" Sidney (born 8 September 2005) is a former gymnast who used to be a Level 8 Coral Girl. She has a YouTube channel called In Mad's World and a gymnastics YouTube channel called In Mad's Gym.
Moo was born on 8 September 2005 in Maryland. She has an older brother named Kyle.
Moo began gymnastics at three years old. Before she stopped gymnastics, she was training USAG Level 9 and competed with Hill's Gymnastics, and had since 2016. She has also competed with 1st Class Gymnastics from 2011-2016.
She began homeschooling in 2015 in order to focus on gymnastics.
- She used to be a Coral Girl, but isn't anymore.
- After switching gyms, she seems to have stopped vlogging. Her most recent vlog, "Crunchy Hot Dog?!?!", was posted on 7 August 2016.
- She is the only Level 8 Coral Girl to have competed a close-to-bar skill on bars (toe-on circle), not including clearhip circles.
- When she was a Coral Girl, she was the tallest on the team, but also the youngest.
- The name of her YouTube channel is a play on the song "Mad World" by Gary Jules.
- Moo's YouTube channel: https://www.youtube.com/channel/UCFrD70VdlgQvlMD04cGsn0g
- Moo's gymnastics YouTube channel:https://www.youtube.com/channel/UCZfLrQcVWw6uJVFchvt5L6g
- Moo's Twitter: https://twitter.com/in_mads_world
- Moo's Instagram: https://www.instagram.com/inmadsworld/?hl=en
- Moo's MyMeetScores: http://www.mymeetscores.com/gymnast.pl?gymnastid=511215