“Your muscles are soft, pliable, and can resist fatigue after thousands of repetitive movements. Researchers at MIT have found a way to make synthetic hydrogels act like muscles by putting them through a vigorous workout. After being mechanically trained in a water bath, the hydrogels became pliant, soft and resistant to breakdown. A paper with the study’s findings was published this week in Proceedings of the National Academy of Sciences…”

Source:
https://www.engadget.com/2019/04/22/mit-scientists-work-out-synthetic-hydrogels-to-make-them-stron/