This is where my current programming is at. (Entering week 4) Usually I sit around 3 sets of 12 (10-15reps depending on the muscle group and how it is balanced). Right now, coming back from being Inconsistent for so long, I really want to gain my strength back and then some. The goal is definitely building muscle, so I'm still eating and not restricted, aiming for maintenance and body recomposition. This is a bit more advanced and not how I would program for most of my clients. However, your programming SHOULD have cycles. You should never be stuck in the same set/rep range forever. (My Chronic pain clients, this Is not for you) Challenge the muscle to change! A good 3 month cycle each in muscle endurance, hypertrophy, and strength would be a great way to change your programming, give you a challenge and keep you from getting bored. Athletes would base this on their sport, season and events.