If you'd like something more in the way of a workout that will actually have some benefits, try this descending/ascending harmony exercise. Once you get comfortable with it, try using the "slip stroke" (up, down down, down) that Perry and all the greats used to make it a fluid and dynamic exercise up and down the neck.
No offense intended. I guess I do tend to be blunt on occasion. (Write first: think later.) I guess that could sound condescending, although it wasn't meant a to be. I thought some plectrum players might like something with more of a workout to it. Compared to the tenor folks, there hasn't been that much in the way of plectrum instruction. Don leads the way in that department and does a great job of it. Anyway, I hope some find this exercise helpful.