To test flexor digitorum superficialis, one finger is flexed at the proximal interphalangeal joint against resistance, while the remaining three fingers are held fully extended (to inactivate flexor digitorum profundus).
Because we are too, obviously. Today Pixar Animation Studios announced updated release dates for each movie, so here they are so you can mark your calendars accordingly: The Incredibles 2 will come out June 15, 2018 and Toy Story 4 will come out June 21, 2019. Toy Story 4.
In terms of developing how Incredibles 2 will operate, Brad Bird has revealed that he is about three-quarters of the way through the development of the script. Like the first Incredibles, he is also directing the film - and it will be his first animated feature since 2007's Ratatouille (having spent the last eight years working on Mission: Impossible - Ghost Protocol, and the aforementioned Tomorrowland).