I don’t really know if they’d count as exercises, but I have a few things I do to warm up – I start off with running over a few basic chord progressions (For example – C, Am, F, G, etc.) gradually working my way up to slightly harder chords and such, then I go over a few scales, mainly Am Pentatonic at the moment. I also do a slightly altered Am pentatonic, so it uses all the same notes of the scale, but they’re just put together like a short little solo going from high E down to low E. Sometimes I’ll also do a more technical exercise focusing on hammer-ons and pull-offs, which includes hammering on and pulling off as fast as possible with each finger, working on one at a time (One fret per finger) for approx. 5 to 10 seconds before moving onto the next finger. From there, I just go into working on songs given to me by my music teacher.