1. The flash has the speedforce. The speedforce lets him move or make movement in any situation, TIME or NO TIME, SPACE or NO SPACE.
2. Stands are an inherit psychic power. You have to be born with a stand in order to have a stand. It is not your "willpower" it is a real superhuman superpower that is animated in a recognizable sometimes humanoid form by Araki for the sake of the readers.
If Araki had drawn the flash, he would draw some dude standing next to the flash called SPEEDO(force) who would help out the flash.