This string skipping loop uses the 3 note per string scale shapes, 1st and 2nd.
Once you get it down use get an egg timer and play it SLOWLY non-stop for 2 minutes, then 5 minutes, then 10 minutes. (Not at 140bpm, that is achievable for a short burst, a couple of cycles)
As always play it VERY SLOWLY and don’t speed it up until you’ve got it under your fingers.