Push the Button, Pull the Trigger, Climb a Mountain, Jump Off a Cliff

Arguing against yourself is a very good exercise for bettering yourself. You can figure a lot about the way you argue this way. You can also find out a lot about your values this way, as well.

Next time you make an argument, think of what kind of counter argument you would make against your own argument. Push both arguments as far as you can, and see where you are and are not willing to concede. It's a very fun exercise and it helps a lot as far as self evaluation goes.