As IDs said, watch a good movie with loads of cool inspirational scenes (LoR, Predator, Aliens, Gladiator etc). Put on some good music (what ever raises the goosebumps on my arms is how I class inspirational tunes), read a decent fantasy/sci-fi book (I recommend David Gemmel, Terry Goodkind or Stephen King).
Try to think in a few well worn cliches
I'm always trying to find some way to include "Once more into the breach" OR "Let slip the dogs of war" into my fiction...no luck yet
The best thing though is hanging out with us and a nice cup of tea.