Okay kiddo, so you know how our bodies have lots of different parts called organs that do different jobs? One of those organs is called the muscles, and they help us move around and do things like run, jump, and play.
Now, inside our muscles there are these teeny tiny things called proteins, and one of those proteins is called follistatin. Follistatin is kind of like a superhero for our muscles because it helps them grow bigger and stronger.
You know how when you exercise, your muscles get a little sore? That's because your muscles are actually tearing a little bit, but then they heal and become even stronger than before. Follistatin helps with that healing process and makes sure your muscles grow and get even stronger.
Scientists are actually really interested in follistatin because it could be used to help people who have diseases that make their muscles weak. They might be able to use follistatin to make those muscles stronger and healthier.
So that's what follistatin is all about, it's a super strong protein that helps our muscles grow and get even stronger!