I start every practice session with this.  Major, minor and Dom7 scales / chords.  I do it from two different finger positions.  Need to add a third to make things complete.  Also working on speeding up the tempo.  Comfortable up to 145 bpm.  I can get through 160 bpm but technique falls apart a bit.

Scales / Arpeggios Circle of 4ths from Eric Brewington on Vimeo.