Okay kiddo, let me try to explain who Ellen Barrett is in a way that you can easily understand. Ellen Barrett is a person who created a type of exercise called "fusion." Imagine playing with different toys and putting them all together to make one super fun toy. That's what fusion exercise is like! Ellen mixed together ideas from yoga, Pilates, and even dancing to create a new way to exercise.
Ellen wanted people to be able to exercise in a fun way that didn't feel like a chore. So she made workouts that were like having a dance party with your friends, but still good for your body. Fusion exercise can help make your muscles strong and keep your heart healthy.
So, Ellen Barrett is a creative person who made exercise fun and exciting!