When I open up Zbrush Core I try to do a quick casual sculpt to warm up and learn/ familiarize myself with the various tools and settings. The aim is not to make a magnificent finished model, but to have fun and explore different ways of approaching various sculpting challenges :D
I have been told that there is an established challenge in the zbrush community called the lunch break challenge, where you spend no more than 30 minutes on a sculpt. I think this is great and encourage any of you who design 3D models to try something similar in your programs of choice for increased efficiency and creativity.
if you like this kind of video let me know, and maybe offer suggestions of simple things you would like to see me try to speed sculpt. :)