Just don't play anything that isn't fun. If you think a...for example...a speedy yngwie run is more fun to play, then practise that instead. Take it slowly and when the coordination between the two hands is good, then take it a little faster.
It's more fun to be able to play a blazing yngwie or vai lick fast, than be able to play that chromatic excercise fast, ins't it?
/Wide
