The Mini Breathing Sphere magically expands from 13cm to 30cm and is very addictive! Physical therapists and yoga educators experienced that it works as a great visual to demonstrate breathing exercises by trying to match the inhale with the expansion of the sphere and the exhale with the collapse. This gives a nice visual for kids to slow down their breath, relaxing the nervous system. The sphere can be used for other fun things too like rolling, looking for shapes within the connecting lines and many other creative games. Can be used by adults as well.