Researchers have developed a backpack that can tell when back muscles are getting tired and respond with a massage, according to New Scientist. The prototype is equipped with electrodes, cables, and a soft massage head that kneads the back.
The electrodes pick up signals that indicate fatigue, and when this is detected, the massage head activates. The idea is to offer relief while the backpack is being worn, though the report does not include data on how well it works or when it might become available.