What is more interesting is, this worked with partners, even if they couldn’t see each other.
Researchers don’t completely understand why this happens.
They speculate that a “more radical hypothesis should also be considered, such as the possibility that effort exertion is influenced by a difference in the scent of someone else exerting high or low effort.”
Desender, K., Beurms, S., & Van den Bussche, E. (2015). “Is mental effort exertion contagious?” Psychonomic Bulletin & Review, , Volume 23, Issue 2, pp 624–631