Here is a list of activities that I use personally, as well as teaching my students, how to "warm-up" the fingers, wrist, and arm, prior to drawing activities. It helps to limber up just as athletes do before an event.
I also suggest and point out the advantage of learning and practicing to draw with your "other" hand. There are times when it could be useful. Try it, see for yourself.
I have included a shortened version of this in my other document on drawing activities.
Click here... Creative Drawing Activities