A new kind of fiber developed by researchers at MIT and in Sweden can be made into cloth that senses how much it is being stretched or compressed, and then provides immediate tactile feedback in the form of pressure or vibration. Such fabrics, the team suggests, could be used in garments that help train singers or athletes to better control their breathing, or that help patients recovering from disease or surgery to recover their normal breathing patterns.

 (Learn more: https://news.mit.edu/2021/fibers-breath-regulating-1015 )