@patriarch yes. you should do a couple easy warm up sets to get blood flowing into the muscle. But yeah a single working set. Once 12 reps become easy you can slowly add a pound every week to a weight belt. In a couple years you could be doing 100 pounds added.
Slow and steady wins the race. Gym rat routines with 5 workouts a week with lots of volume are really unnecessary if your goals is just slowly building muscle mass and strength and in most cases counter productive.
