Control your breathing
Look at distant objects, not on the ground.
Find a pacer, like target a good runner and make sure you're at
least 10 metres near her or such.
Don't think of how tiring it is, think of things that you wanna
do after 2.4, or take the time when you're running to re-organize
your thoughts.
Don't talk when you're running.
And remember to wear clothings that are not too tight, nor too
lose, and comfortable shoes.
i dunno, i always abide by this tips (:
Good luck.