motioncontroller
I learned more from this short post than from longer articles I read earlier today, and a stop at motioncontroller added even more useful detail without going off topic, this site clearly knows how to keep things focused without sacrificing depth which is a hard balance to strike for any writer.
intentionalmovement
Bookmark added with a small mental note that this is a site to keep, and a look at intentionalmovement reinforced the keep status, the verb keep rather than visit captures something about how I think about this kind of site and it is a higher tier of relationship than I have with most places online today.