I don't know how helpful these are, as they may end up hurting, but I like to do forearm stretches. Heres the stretches I do (taken from
http://www.handshb.com/2014/07/forearm-stretches.html ):
![Forearm%2BStretches.jpg]()
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As for breaks, I like to get up and move around, stretch a bit, and just generally do a self checkup. How am I feeling, do I need to use the bathroom, am I hungry, do I need to take a longer break, do I need to stop the class- things like that. I'm also trying to get into the habbit of drinking water on my breaks. Just remember not to push yourself too far- your health is more important than your drawing! Best of luck.