Watch the Speed Picking: Level 1 online guitar lesson by Chris Buono from Guitar Gym: Speed Picking Workouts
Workout #1 is based in A mixolydian and will play the same pattern on all strings only making the necessary adjustments to stay within the scale. The aforementioned resting points are at the end of the second bar at the upbeat of 4 where you have the open string ring out for an 1/8 note breaking up the onslaught of 16ths. At the same time the hammer-ons played throughout gives your picking hand a breather, too. The hardest part of this workout could be making a clean transition from the 6th to 1st strings. Just drop your pick hand down as you dig into the high E and you'll keep any unwanted string noise to a minimum.