The Cosmic Treadmill is a customized tool that is mainly a fancy-looking health club treadmill — handiest, the Flash and other people with identical talents can use it to trip in time. An integral a part of the Flash’s comedian e book adventures, the device is however an excessively, very comedian book-y idea. As such, even in a movie that includes a literal child bathe, the Cosmic Treadmill would almost definitely have stood out … particularly since “The Flash’s” plot does not in reality have room for Barry to require an exterior contraption for time-travelling, because it is predicated closely on his talent to accomplish that with out exterior lend a hand.
With the exception of this, there are possibly two explanation why “The Flash” sought after to keep away from the use of the Cosmic Treadmill as its time-traveling Macguffin of selection. For one, there is the subject of visuals, as a quite regular-looking treadmill is a a ways much less spectacular time-traveling car than, say, a “Again to the Long run”-style DeLorean or a “Physician Who” TARDIS. Of direction, there is additionally the truth that the Arrowverse model of the Flash (Grant Gustin) in fact makes use of a model of the Cosmic Treadmill for trying out his super-speed … and the DC movie universe loves to keep away from any undue connections to the Arrowverse and its lengthy march to cultural irrelevance.