Petty much built my workouts for the last 10 years, or so, around 2 to 4 working set per muscle groups. Even one working set, per exercise, when into rest-pause and other higher rep (20+) squats, Dl's, cleans, C&J, etc. Or even PR work. Every 3 to 4 month I go on a GVT (ATTN: Geo) 6 to 8 week training cycle, to break it up a bit. Suits me well. Good Luck.