Duh...what's oxygen for again? Isn't that what air is made of?

I liberally pour the cool wort into a fermetor.

I vigorously splash the wort around by moving the fermentor or using a wisk or some such stirring implement.

I use a device to inject air into my fermentor, such as an aquariam pump or holes in my transfer apparatus.

I have an oxygen tank and infuse oxygen into the cooled wort with an aeration stone/wand.