Have you ever played tennis and ended up with a strained elbow? Or tried lifting something heavy and felt a nasty twinge somewhere? Or how about that time you sneezed really hard and pulled a muscle?

Now imagine what would happen if you were running around, hitting people, dodging weapons fire, and generally doing the sorts of things that PCs do all the time.

For increased realism, every time a PC does something strenuous you should roll on some sort of "pulling a muscle" table. Really, these guys should be falling apart and limping around all over the place.

(N.B. Implementing this idea may or may not increase your enjoyment of an actual game. Depending how sadistic a GM you are.)

Transcript

Han: I shoot the other guard! 13!
[SFX]: Pow!
Chewbacca: Aha! Take that, you scurrilous libel-spreading lackwit.
[SFX]: Splat!
Chewbacca: And may I add: Ouch. I haven't exercised my pugilism skills in quite some time.
C-3PO: {small} You call this "sneaking"?
{Luke enters, takes clone trooper helmet off}
Luke: Yeesh. My neck is ridiculously itchy.
Han: This plan is going perfectly!
Han: Now, step 3: Spray pheromones all over the flowers.
Luke: In that case, shouldn't we have taken off the leis before we put on the armour?