The Effort Paradox: Prominent models indicate that effort is costly, and that we avoid it. A new series of studies show that this is only half the story. Humans and non-human animals alike tend to associate effort with reward and will sometimes select activities because they require effort

See the source article by following the link below:
The Effort Paradox: Prominent models indicate that effort is costly, and that we avoid it. A new series of studies show that this is only half the story. Humans and non-human animals alike tend to associate effort with reward and will sometimes select activities because they require effort