US gymnastics champ Simone Biles has been actively supporting a campaign for Learning Disabilities and ADHD (Attention deficit/ hyperactivity disorder) back home. The four-time Rio Olympics gold medal-winning gymnast recently spoke to two sisters, who have ADHD shared her own experience with ADHD since age nine. "I think I'll be speaking a little bit more about it [ADHD] because a lot of kids have it.