hey, so your lookin for a good warmup huh? well then, i hope this helps ya out. this riff is a great warmup for both your hands. it helps your fret hand by pressing on multiple strings at one time and it helps your picking hand by using multiple fingers to get the job done, you know, fingerpicking.

also, you've got to watch for the changes in the rythm your picking hands going to be in. ex: lets say you use your thumb-middlefinger-forefinger-thumb-middlefinger-forefinger and so on, but there's a change in that rythm where you'll have to use your thumb twice and where you don't use your thumb at all. ex: thumb-middlefinger-forefinger-thumb-thumb-middlefinger-forefinger...then...thumb-middlefinger-forefinger-middlefinger-thumb....the changes aren't difficult, but you forget them sometimes. well, hope ya learned somethin new or just found a great exercise to help ya improve your playing. have fun!