These elastic bands attach to chairs and give people with ADHD a nice way to fidget

I haven't been tested for ADHD but I fidget a lot. I wish I had a chair that worked with the elastic bands, because they look like a lot of fun to stretch and bounce my legs off.

From Core 77:

Those are elastic "chair bands" sold by Amazon retailer Ozio, and they're intended for schoolkids with ADHD, ADD, autism, and/or SPD (Sensory Processing Disorder). Essentially, the child can freely fidget with the bands with their feet during class, which the retailer says helps promote calmness and increases attentiveness.