Speed Force
The Speed Force is an extradimensional energy source which provides the speedsters of the DC Universe with their powers. Accessing the Speed Force makes it possible to run at incredible speeds, even faster than light, and even to jump in and out of the timestream, thereby travelling - albeit with a limited degree of control - through time. The Speed Force also acts as a kind of Valhalla for deceased speedsters. "" reveals that Barry Allen is a living generator of the Speed Force ever since the accident that transformed him into the Flash.